An (alliance helicopter) may crash.Logical formLearned from6 sentences. A small plane may crash in an area.Logical formLearned from6 sentences. Some (freight trains) may crash head-on.Logical formLearned from6 sentences. An a300 may crash.Logical formLearned from6 sentences. A regional airliner may crash on approach.Logical formLearned from6 sentences. A plane may crash during a (training flight).Logical formLearned from6 sentences. A plane may crash as a result of a (terror attack).Logical formLearned from6 sentences. Hijackers may crash jets.Logical formLearned from6 sentences. Vehicles may crash head-on.Logical formLearned from6 sentences. A US-city may crash in a field.Logical formLearned from6 sentences. A jetliner may crash off a canadian-province.Logical formLearned from6 sentences. An aircraft may crash at some a.m..Logical formLearned from6 sentences. A male may crash into some wall.Logical formLearned from6 sentences. A shell may crash in a backyard of a house.Logical formLearned from6 sentences. A US-city may crash into an ocean.Logical formLearned from6 sentences.