Double conjugation for the verb "heißen" and its compouds: loss of -s in the second singular form of Present Indicative ("du heißt"). 1) Regular: "ich heiße" / "ich heißte" / "geheißt". 2) Irregular: there is a vowel change in the stem of Present tense ("ich heiße"), the stem of Preterite ("ich hieß") and the stem of Past Participle ("geheißen").
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