Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
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| 15 | View Code Duplication | public function getSelectExpression($as = null) |
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| 30 | public function getValueExpression($mark) |
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| 54 | public function dataToDatabase($data) |
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