CLHS: Section 17.2.1.1

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## 17.2.1.1 Examples of Satisfying a Two-Argument Test

     (remove "FOO" '(foo bar "FOO" "BAR" "foo" "bar") :test #'equal)
    =>  (foo bar "BAR" "foo" "bar")
     (remove "FOO" '(foo bar "FOO" "BAR" "foo" "bar") :test #'equalp)
    =>  (foo bar "BAR" "bar")
     (remove "FOO" '(foo bar "FOO" "BAR" "foo" "bar") :test #'string-equal)
    =>  (bar "BAR" "bar")
     (remove "FOO" '(foo bar "FOO" "BAR" "foo" "bar") :test #'string=)
    =>  (BAR "BAR" "foo" "bar")

     (remove 1 '(1 1.0 #C(1.0 0.0) 2 2.0 #C(2.0 0.0)) :test-not #'eql)
    =>  (1)
     (remove 1 '(1 1.0 #C(1.0 0.0) 2 2.0 #C(2.0 0.0)) :test-not #'=)
    =>  (1 1.0 #C(1.0 0.0))
     (remove 1 '(1 1.0 #C(1.0 0.0) 2 2.0 #C(2.0 0.0)) :test (complement #'=))
    =>  (1 1.0 #C(1.0 0.0))

     (count 1 '((one 1) (uno 1) (two 2) (dos 2)) :key #'cadr) =>  2

     (count 2.0 '(1 2 3) :test #'eql :key #'float) =>  1

     (count "FOO" (list (make-pathname :name "FOO" :type "X")
                        (make-pathname :name "FOO" :type "Y"))
            :key #'pathname-name
            :test #'equal)
    =>  2

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