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(arrayp [a])
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(arrayp "asdf")
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(setq primes [2 3 5 7 11 13]) ⇒ [2 3 5 7 11 13] (aref primes 4) ⇒ 11
(aref "abcdefg" 1)
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(setq w [foo bar baz]) ⇒ [foo bar baz] (aset w 0 'fu) ⇒ fu w ⇒ [fu bar baz]
(setq x "asdfasfd") ⇒ "asdfasfd" (aset x 3 ?Z) ⇒ 90 x ⇒ "asdZasfd"
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(setq a [a b c d e f g]) ⇒ [a b c d e f g] (fillarray a 0) ⇒ [0 0 0 0 0 0 0] a ⇒ [0 0 0 0 0 0 0]
(setq s "When in the course") ⇒ "When in the course" (fillarray s ?-) ⇒ "------------------"
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