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|Grammar rule alpha_to_lower//1|
alpha) and return it as a lowercase letter. If C is instantiated and the DCG list is already bound, C must be
lowerand matches both a lower and uppercase letter. If the output list is unbound, its first element is bound to C. For example:
?- alpha_to_lower(0'a, `AB`, R). R = . ?- alpha_to_lower(C, `AB`, R). C = 97, R = . ?- alpha_to_lower(0'a, L, R). L = [97|R].