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in the PONS Dictionary

ob-sum <obesse, obfuī>

obsum
hinderlich sein, schaden
Declension of ob-sum
Case Singular Plural
Nominative ob-sum ob-sa
Genitive ob-sī ob-sōrum
Dative ob-sō ob-sīs
Accusative ob-sum ob-sa
Ablative ob-sō ob-sīs
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