readlist --Operation, no inputs. Abbreviation: rl
     Logo waits for a line to be typed by the user. The contents of the
     line are made into a list, as though typed within square brackets as
     part of a Logo instruction. (The user should not actually type
     brackets around the line, unless s/he desires a list of one element,
     which is a list itself.) That list is the output from the operation.