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(defun foo () 5) ⇒ foo
(foo) ⇒ 5
(defun bar (a &optional b &rest c) (list a b c)) ⇒ bar
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(bar 1) ⇒ (1 nil nil)
(bar) error→ Wrong number of arguments.
(defun capitalize-backwards () "Upcase the last letter of a word." (interactive) (backward-word 1) (forward-word 1) (backward-char 1) (capitalize-word 1)) ⇒ capitalize-backwards
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