{HEAD ~ The mode selection key} is actuated to select a memo mode for inputting and printing out memo data and {TAIL ~ a calculation mode} for operating arithmetic calculation 
{ HEAD ~ The mode selection key } is actuated to select a memo mode for inputting and printing out memo data and { TAIL ~ a calculation mode } for operating arithmetic calculation
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH