An age can be prehistoric.Logical formLearned from148 sentences. A genus can be constituted-of-or-filled-with prehistoric amphibian.Logical formLearned from138 sentences. A monument can be prehistoric.Logical formLearned from134 sentences. Societies can be prehistoric.Logical formLearned from131 sentences. Ancestors can be prehistoric.Logical formLearned from113 sentences. A village can be prehistoric.Logical formLearned from110 sentences. Paintings can be prehistoric.Logical formLearned from109 sentences. (Pile dwellings) can be prehistoric.Logical formLearned from106 sentences. Beasts can be prehistoric.Logical formLearned from105 sentences. Species can be prehistoric.Logical formLearned from100 sentences. Inhabitants can be prehistoric.Logical formLearned from99 sentences. A creature can be prehistoric.Logical formLearned from94 sentences. Days can be prehistoric.Logical formLearned from87 sentences. Ruins can be prehistoric.Logical formLearned from87 sentences. An occupation can be prehistoric.Logical formLearned from86 sentences.