# How can I change the font size of headings using mwcls?

I use \documentclass mwrep.
I want to change:
chapter to have font size 14pt bold
section to have font size 13pt bold
subsection to have font size 12pt bold italic

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My Polish isn't very good, (in fact non-existent) but from the documentation of mwrep I was able to figure out the following:

\SetSectionFormatting{section} {24pt plus5pt minus2pt}