#

## 17.2.2.1 Examples of Satisfying a One-Argument Test

     (count-if #'zerop '(1 #C(0.0 0.0) 0 0.0d0 0.0s0 3)) =>  4

     (remove-if-not #'symbolp '(0 1 2 3 4 5 6 7 8 9 A B C D E F))
    =>  (A B C D E F)
     (remove-if (complement #'symbolp) '(0 1 2 3 4 5 6 7 8 9 A B C D E F))
    =>  (A B C D E F)

     (count-if #'zerop '("foo" "" "bar" "" "" "baz" "quux") :key #'length)
    =>  3

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