MASCULINE FEMININE NEUTER SINGULAR NOM. rubeus rubea rubeum GEN. rubei rubeae rubei DAT. rubeo rubeae rubeo ACC. rubeum rubeam rubeum ABL. rubeo rubea rubeo PLURAL NOM. rubei rubeae rubea GEN. rubeorum rubearum rubeorum DAT. rubeis rubeis rubeis ACC. rubeos rubeas rubea ABL. rubeis rubeis rubeis