Birds may travel.Logical formLearned from21 sentences. (Passenger miles) may be travelled.Logical formLearned from21 sentences. A truck may travel.Logical formLearned from21 sentences. A path may be travelled.Logical formLearned from21 sentences. An employee may travel.Logical formLearned from21 sentences. A female may travel throughout the world.Logical formLearned from21 sentences. Persons may travel some hours.Logical formLearned from21 sentences. A person may travel a land.Logical formLearned from21 sentences. Persons may travel to a place.Logical formLearned from21 sentences. Crops may travel.Logical formLearned from21 sentences. Persons may travel thousands of miles.Logical formLearned from21 sentences. A male may travel throughout a region.Logical formLearned from21 sentences. A person may travel around a us-state.Logical formLearned from21 sentences. Winner may travel on itinerary.Logical formLearned from21 sentences. A French president may travel to a world-city.Logical formLearned from21 sentences.