An attack can be unstoppable.Logical formLearned from16 sentences. Laughter can be unstoppable.Logical formLearned from16 sentences. A US-president can be unstoppable.Logical formLearned from16 sentences. Momentum can be unstoppable.Logical formLearned from16 sentences. A flood can be unstoppable.Logical formLearned from15 sentences. A beast can be unstoppable.Logical formLearned from15 sentences. A person may look unstoppable.Logical formLearned from15 sentences. A juggernaut can be unstoppable.Logical formLearned from15 sentences. An offense may look unstoppable.Logical formLearned from14 sentences. Machines can be unstoppable.Logical formLearned from14 sentences. A slide can be unstoppable.Logical formLearned from14 sentences. A world-city can be unstoppable.Logical formLearned from14 sentences. A stream can be unstoppable.Logical formLearned from14 sentences. A (freight train) can be unstoppable.Logical formLearned from14 sentences. A return can be unstoppable.Logical formLearned from14 sentences.