seven dialectal groups
...that there are seven dialectal groups of the Polish language, each primarily associated with a certain geographical region?
...that there are <b id="mwFK4"><a class="mw-redirect" href="./Dialects_of_the_Polish_language" id="mwFK8" rel="mw:WikiLink" title="Dialects of the Polish language">seven dialectal groups</a></b> of the <a href="./Polish_language" id="mwFLA" rel="mw:WikiLink" title="Polish language">Polish language</a>, each primarily associated with a certain geographical region?