{TAIL ~ means} for indicating the halting of {HEAD ~ the actuation} of the plurality of assignable user actuated switches or keys; and 
{ TAIL ~ means } for indicating the halting of { HEAD ~ the actuation } of the plurality of assignable user actuated switches or keys ; and
TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH