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samth/fancy-app

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(map (+ 1 _) (list 1 2 3))
(map (- 1 _) (list 1 2 3))
(map (- _ 1) (list 1 2 3))
(map (- _ _) (list 10 20 30) (list 1 2 3)) ;; => (list 9 18 27)

(+ 1 (+ _ 2)) ;; => +: expected number, got #<procedure>