Match each base form to its past participle.

Explication

The past-participle pattern mix here is 4 verbs using separate changes for past and participle, 1 verb using a participle that returns to the base pattern, and 1 verb using one shared past-and-participle pattern. The participle match follows the verb's own irregular class, so resemblance to another verb's past form does not establish it; the dominant class is separate changes for past and participle (4 of 6), with 3 pattern classes represented.