Add ch-upper? and ch-lower? words
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@ -122,6 +122,10 @@ HINTS: >title string ;
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: >case-fold ( string -- fold )
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>upper >lower ;
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: ch-lower? ( ch -- ? ) dup ch>lower = ;
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: ch-upper? ( ch -- ? ) dup ch>upper = ;
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: lower? ( string -- ? ) dup >lower = ;
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: upper? ( string -- ? ) dup >upper = ;
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