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Documentation
Mathematica
Built-in Functions
Programming
Pattern Matching
Blank (_)
BlankSequence (__)
BlankNullSequence (___)
Alternatives (|)
Pattern (:)
Optional (_.)
Repeated (..)
RepeatedNull (...)
Condition (/;)
PatternTest (?)
Verbatim
HoldPattern
Orderless
Flat
OneIdentity
Default
Cases
Position
Select
DeleteCases
Count
MatchQ
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