VolumePacker::tryAndStackItemsIntoSpace() - Code Metrics - Inspection of "Add helper for determining if last item" - dvdoug/BoxPacker - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — issue89 ( 529e43...9b8738 )

by Doug

created 2017-12-23 21:06 UTC

VolumePacker::tryAndStackItemsIntoSpace() B

↳ Parent: VolumePacker

Complexity

Conditions	4
Paths	3

Size

Total Lines	32
Code Lines	28

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	16
CRAP Score	4

Importance

Changes

Metric	Value
c	0
b	0
f	0
dl	0
loc	32
ccs	16
cts	16
cp	1
rs	8.5806
cc	4
eloc	28
nc	3
nop	9
crap	4

How to fix Many Parameters

<?php
/**
 * Box packing (3D bin packing, knapsack problem).
 *
 * @author Doug Wright
 */
declare(strict_types=1);

namespace DVDoug\BoxPacker;

use Psr\Log\LoggerAwareInterface;
use Psr\Log\LoggerAwareTrait;
use Psr\Log\NullLogger;

/**
 * Actual packer.
 *
 * @author Doug Wright
 */
class VolumePacker implements LoggerAwareInterface
{
    use LoggerAwareTrait;

    /**
     * Box to pack items into.
     *
     * @var Box
     */
    protected $box;

    /**
     * @var int
     */
    protected $boxWidth;

    /**
     * @var int
     */
    protected $boxLength;

    /**
     * List of items to be packed.
     *
     * @var ItemList
     */
    protected $items;

    /**
     * List of items to be packed.
     *
     * @var ItemList
     */
    protected $skippedItems;

    /**
     * Remaining weight capacity of the box.
     *
     * @var int
     */
    protected $remainingWeight;

    /**
     * Whether the box was rotated for packing.
     *
     * @var bool
     */
    protected $boxRotated = false;

    /**
     * Constructor.
     *
     * @param Box      $box
     * @param ItemList $items
     */
    public function __construct(Box $box, ItemList $items)
    {
        $this->box = $box;
        $this->items = $items;

        $this->boxWidth = max($this->box->getInnerWidth(), $this->box->getInnerLength());
        $this->boxLength = min($this->box->getInnerWidth(), $this->box->getInnerLength());
        $this->remainingWeight = $this->box->getMaxWeight() - $this->box->getEmptyWeight();
        $this->skippedItems = new ItemList();
        $this->logger = new NullLogger();

        // we may have just rotated the box for packing purposes, record if we did
        if ($this->box->getInnerWidth() != $this->boxWidth || $this->box->getInnerLength() != $this->boxLength) {
            $this->boxRotated = true;
        }
    }

    /**
     * Pack as many items as possible into specific given box.
     *
     * @return PackedBox packed box
     */
    public function pack(): PackedBox
    {
        $this->logger->debug("[EVALUATING BOX] {$this->box->getReference()}");

        $packedItems = new PackedItemList();
        $prevItem = null;

        $x = $y = $z = $rowWidth = $rowLength = $layerWidth = $layerLength = $layerDepth = 0;

        $packingWidthLeft = $this->boxWidth;
        $packingLengthLeft = $this->boxLength;
        $packingDepthLeft = $this->box->getInnerDepth();

        while (count($this->items) > 0) {
            $itemToPack = $this->items->extract();
            $nextItem = count($this->items) ? $this->items->top() : null;

            //skip items that are simply too heavy or too large
            if (!$this->checkConstraints($itemToPack, $packedItems)) {
                $this->rebuildItemList();
                continue;
            }

            $orientatedItem = $this->getOrientationForItem($itemToPack, $prevItem, $nextItem, $this->hasItemsLeftToPack(), $packingWidthLeft, $packingLengthLeft, $packingDepthLeft);

            if ($orientatedItem instanceof OrientatedItem) {
                $packedItem = PackedItem::fromOrientatedItem($orientatedItem, $x, $y, $z);
                $packedItems->insert($packedItem);
                $this->remainingWeight -= $orientatedItem->getItem()->getWeight();
                $packingWidthLeft -= $orientatedItem->getWidth();

                $rowWidth += $orientatedItem->getWidth();
                $rowLength = max($rowLength, $orientatedItem->getLength());
                $layerDepth = max($layerDepth, $orientatedItem->getDepth());

                //allow items to be stacked in place within the same footprint up to current layer depth
                $stackableDepth = $layerDepth - $orientatedItem->getDepth();
                $this->tryAndStackItemsIntoSpace($packedItems, $prevItem, $nextItem, $orientatedItem->getWidth(), $orientatedItem->getLength(), $stackableDepth, $x, $y, $z + $orientatedItem->getDepth());
                $x += $orientatedItem->getWidth();

                $prevItem = $packedItem;

                $this->rebuildItemList();
            } else {
                if ($layerWidth == 0 && $layerDepth == 0) { // zero items on layer
                    $this->logger->debug("doesn't fit on layer even when empty, skipping for good");
                    $prevItem = null;
                    continue;
                } elseif (count($this->items) > 0) { // skip for now, move on to the next item
                    $this->logger->debug("doesn't fit, skipping for now");
                    $this->skippedItems->insert($itemToPack);
                } elseif ($x > 0 && $packingLengthLeft >= min($itemToPack->getWidth(), $itemToPack->getLength())) {
                    $this->logger->debug('No more fit in width wise, resetting for new row');
                    $layerWidth = max($layerWidth, $rowWidth);
                    $layerLength += $rowLength;
                    $packingWidthLeft += $rowWidth;
                    $packingLengthLeft -= $rowLength;
                    $y += $rowLength;
                    $x = $rowWidth = $rowLength = 0;
                    $this->rebuildItemList();
                    $this->items->insert($itemToPack);
                    $prevItem = null;
                    continue;
                } else {
                    $this->logger->debug('no items fit, so starting next vertical layer');

                    $layerWidth = max($layerWidth, $rowWidth);
                    $layerLength += $rowLength;
                    $packingWidthLeft = $rowWidth ? min(intval($layerWidth * 1.1), $this->boxWidth) : $this->boxWidth;
                    $packingLengthLeft = $rowLength ? min(intval($layerLength * 1.1), $this->boxLength) : $this->boxLength;
                    $packingDepthLeft -= $layerDepth;

                    $z += $layerDepth;
                    $x = $y = $rowWidth = $rowLength = $layerWidth = $layerLength = $layerDepth = 0;

                    $this->rebuildItemList();
                    $this->items->insert($itemToPack);
                    $prevItem = null;
                }
            }
        }
        $this->logger->debug('done with this box');

        return $this->createPackedBox($packedItems);
    }

    /**
     * @param Item            $itemToPack
     * @param PackedItem|null $prevItem
     * @param Item|null       $nextItem
     * @param bool            $isLastItem
     * @param int             $maxWidth
     * @param int             $maxLength
     * @param int             $maxDepth
     *
     * @return OrientatedItem|null
     */
    protected function getOrientationForItem(
        Item $itemToPack,
        ?PackedItem $prevItem,
        ?Item $nextItem,
        bool $isLastItem,
        int $maxWidth,
        int $maxLength,
        int $maxDepth
    ): ?OrientatedItem {
        $this->logger->debug(
            "evaluating item {$itemToPack->getDescription()} for fit",
            [
                'item'  => $itemToPack,
                'space' => [
                    'maxWidth'    => $maxWidth,
                    'maxLength'   => $maxLength,
                    'maxDepth'    => $maxDepth,
                ],
            ]
        );

        $prevOrientatedItem = $prevItem ? $prevItem->toOrientatedItem() : null;

        $orientatedItemFactory = new OrientatedItemFactory();
        $orientatedItemFactory->setLogger($this->logger);
        $orientatedItem = $orientatedItemFactory->getBestOrientation($this->box, $itemToPack, $prevOrientatedItem, $nextItem, $isLastItem, $maxWidth, $maxLength, $maxDepth);

        return $orientatedItem;
    }

    /**
     * Figure out if we can stack the next item vertically on top of this rather than side by side
     * Used when we've packed a tall item, and have just put a shorter one next to it.
     *
     * @param PackedItemList  $packedItems
     * @param PackedItem|null $prevItem
     * @param Item|null       $nextItem
     * @param int             $maxWidth
     * @param int             $maxLength
     * @param int             $maxDepth
     * @param int             $x
     * @param int             $y
     * @param int             $z
     */
    protected function tryAndStackItemsIntoSpace(
        PackedItemList $packedItems,
        ?PackedItem $prevItem,
        ?Item $nextItem,
        int $maxWidth,
        int $maxLength,
        int $maxDepth,
        int $x,
        int $y,
        int $z
    ): void {
        while (count($this->items) > 0 && $this->checkNonDimensionalConstraints($this->items->top(), $packedItems)) {
            $stackedItem = $this->getOrientationForItem(
                $this->items->top(),
                $prevItem,
                $nextItem,
                $this->items->count() === 1,
                $maxWidth,
                $maxLength,
                $maxDepth
            );
            if ($stackedItem) {
                $this->remainingWeight -= $this->items->top()->getWeight();
                $packedItems->insert(PackedItem::fromOrientatedItem($stackedItem, $x, $y, $z));
                $this->items->extract();
                $maxDepth -= $stackedItem->getDepth();
                $z += $stackedItem->getDepth();
            } else {
                break;
            }
        }
    }

    /**
     * Check item generally fits into box.
     *
     * @param Item           $itemToPack
     * @param PackedItemList $packedItems
     *
     * @return bool
     */
    protected function checkConstraints(
        Item $itemToPack,
        PackedItemList $packedItems
    ): bool {
        return $this->checkNonDimensionalConstraints($itemToPack, $packedItems) &&
               $this->checkDimensionalConstraints($itemToPack);
    }

    /**
     * As well as purely dimensional constraints, there are other constraints that need to be met
     * e.g. weight limits or item-specific restrictions (e.g. max <x> batteries per box).
     *
     * @param Item           $itemToPack
     * @param PackedItemList $packedItems
     *
     * @return bool
     */
    protected function checkNonDimensionalConstraints(Item $itemToPack, PackedItemList $packedItems): bool
    {
        $weightOK = $itemToPack->getWeight() <= $this->remainingWeight;

        if ($itemToPack instanceof ConstrainedItem) {
            return $weightOK && $itemToPack->canBePackedInBox($packedItems, $this->box);
        }

        return $weightOK;
    }

    /**
     * Check the item physically fits in the box (at all).
     *
     * @param Item $itemToPack
     *
     * @return bool
     */
    protected function checkDimensionalConstraints(Item $itemToPack): bool
    {
        $orientatedItemFactory = new OrientatedItemFactory();
        $orientatedItemFactory->setLogger($this->logger);

        return (bool) $orientatedItemFactory->getPossibleOrientationsInEmptyBox($itemToPack, $this->box);
    }

    /**
     * Reintegrate skipped items into main list when nothing left to process.
     */
    protected function rebuildItemList(): void
    {
        if (count($this->items) === 0) {
            $this->items = $this->skippedItems;
            $this->skippedItems = new ItemList();
        }
    }

    /**
     * @param PackedItemList $packedItems
     *
     * @return PackedBox
     */
    protected function createPackedBox(PackedItemList $packedItems): PackedBox
    {
        //if we rotated the box for packing, need to swap back width/length of the packed items
        if ($this->boxRotated) {
            $items = iterator_to_array($packedItems, false);
            $packedItems = new PackedItemList();
            /** @var PackedItem $item */
            foreach ($items as $item) {
                $packedItems->insert(
                    new PackedItem(
                        $item->getItem(),
                        $item->getY(),
                        $item->getX(),
                        $item->getZ(),
                        $item->getLength(),
                        $item->getWidth(),
                        $item->getDepth()
                    )
                );
            }
        }

        return new PackedBox($this->box, $packedItems);
    }

    /**
     * Are there items left to pack?
     *
     * @return bool
     */
    protected function hasItemsLeftToPack(): bool
    {
        return count($this->skippedItems) + count($this->items) === 0;
    }
}


1		<?php
2		/**
3		* Box packing (3D bin packing, knapsack problem).
4		*
5		* @author Doug Wright
6		*/
7		declare(strict_types=1);
8
9		namespace DVDoug\BoxPacker;
10
11		use Psr\Log\LoggerAwareInterface;
12		use Psr\Log\LoggerAwareTrait;
13		use Psr\Log\NullLogger;
14
15		/**
16		* Actual packer.
17		*
18		* @author Doug Wright
19		*/
20		class VolumePacker implements LoggerAwareInterface
21		{
22		use LoggerAwareTrait;
23
24		/**
25		* Box to pack items into.
26		*
27		* @var Box
28		*/
29		protected $box;
30
31		/**
32		* @var int
33		*/
34		protected $boxWidth;
35
36		/**
37		* @var int
38		*/
39		protected $boxLength;
40
41		/**
42		* List of items to be packed.
43		*
44		* @var ItemList
45		*/
46		protected $items;
47
48		/**
49		* List of items to be packed.
50		*
51		* @var ItemList
52		*/
53		protected $skippedItems;
54
55		/**
56		* Remaining weight capacity of the box.
57		*
58		* @var int
59		*/
60		protected $remainingWeight;
61
62		/**
63		* Whether the box was rotated for packing.
64		*
65		* @var bool
66		*/
67		protected $boxRotated = false;
68
69		/**
70		* Constructor.
71		*
72		* @param Box $box
73		* @param ItemList $items
74		*/
75	37	public function __construct(Box $box, ItemList $items)
76		{
77	37	$this->box = $box;
78	37	$this->items = $items;
79
80	37	$this->boxWidth = max($this->box->getInnerWidth(), $this->box->getInnerLength());
81	37	$this->boxLength = min($this->box->getInnerWidth(), $this->box->getInnerLength());
82	37	$this->remainingWeight = $this->box->getMaxWeight() - $this->box->getEmptyWeight();
83	37	$this->skippedItems = new ItemList();
84	37	$this->logger = new NullLogger();
85
86		// we may have just rotated the box for packing purposes, record if we did
87	37	if ($this->box->getInnerWidth() != $this->boxWidth \|\| $this->box->getInnerLength() != $this->boxLength) {
88	9	$this->boxRotated = true;
89		}
90		}
91
92		/**
93		* Pack as many items as possible into specific given box.
94		*
95		* @return PackedBox packed box
96		*/
97	37	public function pack(): PackedBox
98		{
99	37	$this->logger->debug("[EVALUATING BOX] {$this->box->getReference()}");
100
101	37	$packedItems = new PackedItemList();
102	37	$prevItem = null;
103
104	37	$x = $y = $z = $rowWidth = $rowLength = $layerWidth = $layerLength = $layerDepth = 0;
105
106	37	$packingWidthLeft = $this->boxWidth;
107	37	$packingLengthLeft = $this->boxLength;
108	37	$packingDepthLeft = $this->box->getInnerDepth();
109
110	37	while (count($this->items) > 0) {
111	37	$itemToPack = $this->items->extract();
112	37	$nextItem = count($this->items) ? $this->items->top() : null;
113
114		//skip items that are simply too heavy or too large
115	37	if (!$this->checkConstraints($itemToPack, $packedItems)) {
116	10	$this->rebuildItemList();
117	10	continue;
118		}
119
120	37	$orientatedItem = $this->getOrientationForItem($itemToPack, $prevItem, $nextItem, $this->hasItemsLeftToPack(), $packingWidthLeft, $packingLengthLeft, $packingDepthLeft);
121
122	37	if ($orientatedItem instanceof OrientatedItem) {
123	37	$packedItem = PackedItem::fromOrientatedItem($orientatedItem, $x, $y, $z);
124	37	$packedItems->insert($packedItem);
125	37	$this->remainingWeight -= $orientatedItem->getItem()->getWeight();
126	37	$packingWidthLeft -= $orientatedItem->getWidth();
127
128	37	$rowWidth += $orientatedItem->getWidth();
129	37	$rowLength = max($rowLength, $orientatedItem->getLength());
130	37	$layerDepth = max($layerDepth, $orientatedItem->getDepth());
131
132		//allow items to be stacked in place within the same footprint up to current layer depth
133	37	$stackableDepth = $layerDepth - $orientatedItem->getDepth();
134	37	$this->tryAndStackItemsIntoSpace($packedItems, $prevItem, $nextItem, $orientatedItem->getWidth(), $orientatedItem->getLength(), $stackableDepth, $x, $y, $z + $orientatedItem->getDepth());
135	37	$x += $orientatedItem->getWidth();
136
137	37	$prevItem = $packedItem;
138
139	37	$this->rebuildItemList();
140		} else {
141	25	if ($layerWidth == 0 && $layerDepth == 0) { // zero items on layer
142	4	$this->logger->debug("doesn't fit on layer even when empty, skipping for good");
143	4	$prevItem = null;
144	4	continue;
145	25	} elseif (count($this->items) > 0) { // skip for now, move on to the next item
146	22	$this->logger->debug("doesn't fit, skipping for now");
147	22	$this->skippedItems->insert($itemToPack);
148	25	} elseif ($x > 0 && $packingLengthLeft >= min($itemToPack->getWidth(), $itemToPack->getLength())) {
149	25	$this->logger->debug('No more fit in width wise, resetting for new row');
150	25	$layerWidth = max($layerWidth, $rowWidth);
151	25	$layerLength += $rowLength;
152	25	$packingWidthLeft += $rowWidth;
153	25	$packingLengthLeft -= $rowLength;
154	25	$y += $rowLength;
155	25	$x = $rowWidth = $rowLength = 0;
156	25	$this->rebuildItemList();
157	25	$this->items->insert($itemToPack);
158	25	$prevItem = null;
159	25	continue;
160		} else {
161	19	$this->logger->debug('no items fit, so starting next vertical layer');
162
163	19	$layerWidth = max($layerWidth, $rowWidth);
164	19	$layerLength += $rowLength;
165	19	$packingWidthLeft = $rowWidth ? min(intval($layerWidth * 1.1), $this->boxWidth) : $this->boxWidth;
166	19	$packingLengthLeft = $rowLength ? min(intval($layerLength * 1.1), $this->boxLength) : $this->boxLength;
167	19	$packingDepthLeft -= $layerDepth;
168
169	19	$z += $layerDepth;
170	19	$x = $y = $rowWidth = $rowLength = $layerWidth = $layerLength = $layerDepth = 0;
171
172	19	$this->rebuildItemList();
173	19	$this->items->insert($itemToPack);
174	19	$prevItem = null;
175		}
176		}
177		}
178	37	$this->logger->debug('done with this box');
179
180	37	return $this->createPackedBox($packedItems);
181		}
182
183		/**
184		* @param Item $itemToPack
185		* @param PackedItem\|null $prevItem
186		* @param Item\|null $nextItem
187		* @param bool $isLastItem
188		* @param int $maxWidth
189		* @param int $maxLength
190		* @param int $maxDepth
191		*
192		* @return OrientatedItem\|null
193		*/
194	37	protected function getOrientationForItem(
195		Item $itemToPack,
196		?PackedItem $prevItem,
197		?Item $nextItem,
198		bool $isLastItem,
199		int $maxWidth,
200		int $maxLength,
201		int $maxDepth
202		): ?OrientatedItem {
203	37	$this->logger->debug(
204	37	"evaluating item {$itemToPack->getDescription()} for fit",
205		[
206	37	'item' => $itemToPack,
207		'space' => [
208	37	'maxWidth' => $maxWidth,
209	37	'maxLength' => $maxLength,
210	37	'maxDepth' => $maxDepth,
211		],
212		]
213		);
214
215	37	$prevOrientatedItem = $prevItem ? $prevItem->toOrientatedItem() : null;
216
217	37	$orientatedItemFactory = new OrientatedItemFactory();
218	37	$orientatedItemFactory->setLogger($this->logger);
219	37	$orientatedItem = $orientatedItemFactory->getBestOrientation($this->box, $itemToPack, $prevOrientatedItem, $nextItem, $isLastItem, $maxWidth, $maxLength, $maxDepth);
220
221	37	return $orientatedItem;
222		}
223
224		/**
225		* Figure out if we can stack the next item vertically on top of this rather than side by side
226		* Used when we've packed a tall item, and have just put a shorter one next to it.
227		*
228		* @param PackedItemList $packedItems
229		* @param PackedItem\|null $prevItem
230		* @param Item\|null $nextItem
231		* @param int $maxWidth
232		* @param int $maxLength
233		* @param int $maxDepth
234		* @param int $x
235		* @param int $y
236		* @param int $z
237		*/
238	37	protected function tryAndStackItemsIntoSpace(
239		PackedItemList $packedItems,
240		?PackedItem $prevItem,
241		?Item $nextItem,
242		int $maxWidth,
243		int $maxLength,
244		int $maxDepth,
245		int $x,
246		int $y,
247		int $z
248		): void {
249	37	while (count($this->items) > 0 && $this->checkNonDimensionalConstraints($this->items->top(), $packedItems)) {
250	33	$stackedItem = $this->getOrientationForItem(
251	33	$this->items->top(),
252	33	$prevItem,
253	33	$nextItem,
254	33	$this->items->count() === 1,
255	33	$maxWidth,
256	33	$maxLength,
257	33	$maxDepth
258		);
259	33	if ($stackedItem) {
260	3	$this->remainingWeight -= $this->items->top()->getWeight();
261	3	$packedItems->insert(PackedItem::fromOrientatedItem($stackedItem, $x, $y, $z));
262	3	$this->items->extract();
263	3	$maxDepth -= $stackedItem->getDepth();
264	3	$z += $stackedItem->getDepth();
265		} else {
266		break;
267		}
268		}
269		}
270
271		/**
272		* Check item generally fits into box.
273		*
274		* @param Item $itemToPack
275		* @param PackedItemList $packedItems
276		*
277		* @return bool
278		*/
279	37	protected function checkConstraints(
280		Item $itemToPack,
281		PackedItemList $packedItems
282		): bool {
283	37	return $this->checkNonDimensionalConstraints($itemToPack, $packedItems) &&
284	37	$this->checkDimensionalConstraints($itemToPack);
285		}
286
287		/**
288		* As well as purely dimensional constraints, there are other constraints that need to be met
289		* e.g. weight limits or item-specific restrictions (e.g. max <x> batteries per box).
290		*
291		* @param Item $itemToPack
292		* @param PackedItemList $packedItems
293		*
294		* @return bool
295		*/
296	37	protected function checkNonDimensionalConstraints(Item $itemToPack, PackedItemList $packedItems): bool
297		{
298	37	$weightOK = $itemToPack->getWeight() <= $this->remainingWeight;
299
300	37	if ($itemToPack instanceof ConstrainedItem) {
301	1	return $weightOK && $itemToPack->canBePackedInBox($packedItems, $this->box);
302		}
303
304		return $weightOK;
305		}
306
307		/**
308		* Check the item physically fits in the box (at all).
309		*
310		* @param Item $itemToPack
311		*
312		* @return bool
313		*/
314	37	protected function checkDimensionalConstraints(Item $itemToPack): bool
315		{
316	37	$orientatedItemFactory = new OrientatedItemFactory();
317	37	$orientatedItemFactory->setLogger($this->logger);
318
319	37	return (bool) $orientatedItemFactory->getPossibleOrientationsInEmptyBox($itemToPack, $this->box);
320		}
321
322		/**
323		* Reintegrate skipped items into main list when nothing left to process.
324		*/
325	37	protected function rebuildItemList(): void
326		{
327	37	if (count($this->items) === 0) {
328	37	$this->items = $this->skippedItems;
329	37	$this->skippedItems = new ItemList();
330		}
331		}
332
333		/**
334		* @param PackedItemList $packedItems
335		*
336		* @return PackedBox
337		*/
338	37	protected function createPackedBox(PackedItemList $packedItems): PackedBox
339		{
340		//if we rotated the box for packing, need to swap back width/length of the packed items
341	37	if ($this->boxRotated) {
342	9	$items = iterator_to_array($packedItems, false);
343	9	$packedItems = new PackedItemList();
344		/** @var PackedItem $item */
345	9	foreach ($items as $item) {
346	9	$packedItems->insert(
347	9	new PackedItem(
348	9	$item->getItem(),
349	9	$item->getY(),
350	9	$item->getX(),
351	9	$item->getZ(),
352	9	$item->getLength(),
353	9	$item->getWidth(),
354	9	$item->getDepth()
355		)
356		);
357		}
358		}
359
360	37	return new PackedBox($this->box, $packedItems);
361		}
362
363		/**
364		* Are there items left to pack?
365		*
366		* @return bool
367		*/
368	37	protected function hasItemsLeftToPack(): bool
369		{
370	37	return count($this->skippedItems) + count($this->items) === 0;
371		}
372		}
373

dvdoug / BoxPacker

Push — issue89 ( 529e43...9b8738 )

VolumePacker::tryAndStackItemsIntoSpace() B

Complexity

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Duplication

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How to fix Many Parameters

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