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%ascii offset of "a" sub96(Code, Number) :- Number is Code - 96. lettersum(String, Output) :- string_codes(String, Codes), maplist(sub96, Codes, Numbers), sumlist(Numbers, Output). /** <examples> ?- lettersum("microspectrophotometries", Output). ?- lettersum("excellent", Output). ?- lettersum("z", Output). ?- lettersum("", Output). ?- lettersum("a", Output). */