Madruga and others,

can you give me an example why "((ab)c)d" is also a combination?
I think it's the same as "(ab)cd"

Also the number of operator permutations I think is 128.
Why? check this:

-1*-4*-2*-3

So the possible permutations are 2*4*4*4=128
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Patrick Rutten

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