Match each base form to its past participle.

Explanation

This past-participle set combines 3 verbs using separate changes for past and participle, 2 verbs using one shared past-and-participle pattern, and 1 verb using a shared past-and-participle pattern with accepted spelling variants. Each verb's irregular family controls the participle result; a past-tense lookalike is not enough unless that family shares the forms; the dominant class is separate changes for past and participle (3 of 6), with 3 pattern classes represented.