Strong/weak verbs

I've been thinking long and detailed through my German studies from many
years ago. Weak German verbs add -te for past tense and ge- + -te for the
past participle. Strong verbs change by ablaut. I cannot think of any verbs
which change by ablaut and used the weak verb prefix/postfix. Is there such
a thing? Would such a pattern exist in any other natlangs?
Scotto

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