Double conjugation for the verb "sieden" and its compouds: 1) Regular: "ich siede" / "ich siedete" / "gesiedet.". 2) Irregular: there is a vowel change in the stem of Present tense ("ich siede"), the stem of Preterite ("ich sott") and the stem of Past Participle ("gesotten").
1 verbs follow this model. Below an extract:
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