Where does “pomyślenie” come from?

pomyślenie (Polish) comes from Polish pomyśleć, from Old Polish pomyślić, from Old Polish myślić, from Proto-Slavic mysliti, from Proto-Slavic myslь, from Proto-Indo-European muHdʰ-.

Ancestry of “pomyślenie”, step by step

StepLanguageWordMeaning
1Polishpomyślećto think
2Old Polishpomyślićto think
3Old Polishmyślićto think
4Proto-Slavicmyslitito think
5Proto-Slavicmyslьthought, idea
6Proto-Indo-EuropeanmuHdʰ-—
Every word from Proto-Indo-European muHdʰ- →Every word from Proto-Slavic myslь →Every word from Proto-Slavic mysliti →