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In the following procedure specifications:
Is a character set.
Is a string.
Is a character.
Is a pair of characters interpreted as double–closed range of characters, the car being the lower–limit and the cdr being the upper–limit.
Is a list of characters.
Is a unary character predicate procedure, returning a boolean value when applied to a character.
May be any value at all.
A parameter followed by ... means zero–or–more elements.
Unless otherwise noted in the specification of a procedure, procedures always return character sets that are distinct from the parameter character sets.