Question: Match zero or one element of input. ( l e t ((var (second ( f i r s t pattern) 1) (pat (rest pattern))) (or

"Match zero or one element of input."

( l e t ((var (second ( f i r s t pattern) 1)

(pat (rest pattern)))

(or (pat-match (cons var pat) input bindings)

(pat-match pat input bindings))))

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