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JSR and JSRP instructions are placed only at the
right end of a row.
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A subroutine jump is possible up to 128
times.
One stack is used for one subroutine jump. A total of 128 stacks
can be used in the logic program.
Other instructions that use stacks are FOR and NEXT instructions.
Each instance of FOR/NEXT instructions use two stacks.
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When JSR and JSRP instructions are not conducted,
no subroutine processing is performed.