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Up until its later stages, Old French, alongside Old Occitan, maintained a relic of the old nominal case system of Latin longer than most other Romance languages (with the notable exception of Romanian which still currently maintains a case distinction), differentiating between an oblique case and a nominative case. The phonology was characterized by heavy syllabic stress, which led to the emergence of various complicated diphthongs such as -eau which would later be leveled to monophthongs.[citation needed]