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> (define s "alphaBETA gammaDELTA")
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> (string-upcase s) ;; turn all into upper case
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"ALPHABETA GAMMADELTA"
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> (string-downcase s) ;; turn all into lower case
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"alphabeta gammadelta"
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> (string-titlecase s) ;; capitalise start of each word
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"Alphabeta Gammadelta"
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