I noticed that you use the spelling "contraposative" consistently. I'd only known this as "contrapositive", and Wiktionary agrees: https://en.wiktionary.org/wiki/contrapositive . But I find lots of web hits for "contraposative", so I suspect it's more than just a common typo. Did you learn this specific form from some specific source that contrasted the two?
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[ 2.2 ms ] story [ 17.2 ms ] threadEdit: And to answer your question, no I did not.
I thought it was just a delicious way to bind events.
Edit: Switched to desktop site, and.. that's just how it is