Ex: топить, литься, моросить, мучиться...
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Display one line per family? (here затопить, протопить, растопить. vs утопить, затопить, потопить)
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Have multiple perf form displayed after the imperfective form?
Like топить/за-;про-;рас-
Would first need to find out how many verbs are in this situation and how to manage adding more verbs for the Intermediate level that has already many verbs.
The best solution so far that I could think of would be to use wiktionary to found out about these verbs.