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is_valid(input : IN String) : OUT Boolean
input := LOWERCASE(input)
FOR EACH character IN input
IF character =/= 'a' AND character =/= 'b' AND ... AND character =/= 'f'
RETURN FALSE
END IF
END FOR
RETURN TRUE
is_valid(input : IN String) : OUT Boolean
input := LOWERCASE(input)
FOR EACH character IN input
IF character =/= 'a' AND character =/= 'b' AND ... AND character =/= 'f'
RETURN FALSE
END IF
END FOR
RETURN TRUE
is_valid(input : IN String) : OUT Boolean
input := LOWERCASE(input)
FOR EACH character IN input
IF character =/= 'a' AND character =/= 'b' AND ... AND character =/= 'f'
RETURN FALSE
END IF
END FOR
RETURN TRUE