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4) GTS (GO TO SUBROUTINE).
In a program when you use a certain calculation procedure several
times, you can shorten the program by making he calcualton
procedure a subroutine.
If the is a GTS instruction during program execution, it wil jump to
the speciffied line and run the program from that line as a
subroutine. The execution of the subroutine ends with the END
instruction, and then returns to the next line of the GTS instruction
and executes the instruction on that line.