These are analogous to TENEX's ASSEM ALL and MUD105 STINK.
This is version 56 for ITS, because the TENEX binary claimed to be
version 106, and the 54/104 and 55/105 manuals suggest that the ITS
version number tracked the TENEX one. Zork tests whether ,MUDDLE is less
than 100 to see if it's on ITS.
