(1) Is there a simpler way to define pairwise, which takes an existing  
sequence and then returns its items a pair at a time?

(defn pairwise [& seq]
  (map vector (take-nth 2 seq) (take-nth 2 (rest seq))))

(2) When writing a function like pairwise, are there any bright-line  
rules about whether to use variable arity?

Cheers,
Stuart


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