Cheryl's birthday: Difference between revisions

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→‎{{header|Factor}}: dupd tuck is equivalent to 2dup
(Add Factor)
m (→‎{{header|Factor}}: dupd tuck is equivalent to 2dup)
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: unique-by ( seq quot -- newseq )
dupd tuck2dup map non-repeating '[ @ _ member? ] filter ; inline
 
ALIAS: day first
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