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I'm going to be more careful using parentheses from now on.

Edited: 10 Oct 2013, 11:21 a.m.

Chris, this looks perfectly correct to me. Exponentiation is associative from right to left. The question is, how did you enter the expressions?

2 xy 2 xy 2 xy 2

returns your first example, while

2 x2 x2 x2

returns the second.

To avoid ambiguity stick with RPN! :-)