CHAR<= ====== Syntax: (char<= {<character> ...}) This function compares the given characters in the same way like numbers. The following ordering on characters exists: A < ... < Z a < ... < z 0 < ... < 9 The ordering between those groups is unspecified and depends on the implementation. But most of the time the characters are in the ASCII ordering. 0...9 < A...Z < a...z. It returns T, when the ordering is given, otherwise NIL. example: >(char<= #\a #\b) T