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<?php
class MyCountable implements Countable {}
class MyOuterIterator implements OuterIterator {}
class MyRecursiveIterator implements RecursiveIterator {}
class MySeekableIterator implements SeekableIterator {}
class MySerializable implements Serializable {
public function __sleep() {}
public function __wakeup() {}
}
class MySplObserver implements SplObserver {}
class MySplSubject implements SplSubject {}
class MyJsonSerializable implements JsonSerializable {}
class MySessionHandlerInterface implements SessionHandlerInterface {}
class MyMultiple implements SplSubject, JsonSerializable, Countable {}
class MyUppercase implements COUNTABLE {}
class MyLowercase implements countable {}