Function.ctype-
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function.ctype-alnum()
function.ctype-alpha()
function.ctype-cntrl()
function.ctype-digit()
function.ctype-graph()
function.ctype-lower()
function.ctype-print()
function.ctype-punct()
function.ctype-space()
function.ctype-upper()
function.ctype-xdigit()