A US-president may board a helicopter.Logical formLearned from22 sentences. A male may board a jet.Logical formLearned from22 sentences. Passengers may board a plane.Logical formLearned from22 sentences. Volunteers may board at a risk.Logical formLearned from22 sentences. Persons may board buses.Logical formLearned from21 sentences. Persons may board a bus.Logical formLearned from21 sentences. A person may board a boat.Logical formLearned from21 sentences. A person may board an aircraft.Logical formLearned from21 sentences. Passengers may board a train.Logical formLearned from21 sentences. Passengers may board trains.Logical formLearned from21 sentences. Officers may board a vessel.Logical formLearned from21 sentences. A passenger may board a flight.Logical formLearned from20 sentences. A person may board a boat.Logical formLearned from20 sentences. A person may board a plane.Logical formLearned from20 sentences. A man may board a flight.Logical formLearned from20 sentences.