in your test suite it seems odd that rpz('a','b','-') is interpreted as 'a-b' while rpz('a','b','/') is interpreted as 'b/a' (instead of 'a/b'). Same goes for rpz('a','b','%') which is interpreted as 'b%a' instead of 'a%b'. Last, your last test case rpn(z(1),'+',z(2),'*',z(1),z(3),'-',z(4),z(5),'%','*') is plain weird... it should probably read rpn(z(1),z(2),'+',z(1),'*',z(3),'-',z(4),z(5),'%','*') instead...
Thank you for your comments; I will update the description and fix last test case.
I will retire the last test case for the problem.
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