Volunteers may travel.Logical formLearned from27 sentences. Persons may travel with a female.Logical formLearned from27 sentences. Light may travel in lines.Logical formLearned from27 sentences. A male may travel thousands of miles.Logical formLearned from27 sentences. Leader may travel.Logical formLearned from27 sentences. Some others may travel with a male.Logical formLearned from27 sentences. A side may travel to a country.Logical formLearned from27 sentences. A person may travel with a president.Logical formLearned from26 sentences. A band may travel to a world-city.Logical formLearned from26 sentences. A man may travel to a US-city.Logical formLearned from26 sentences. (Accident investigators) may travel to a mine.Logical formLearned from26 sentences. Some students may travel to a US-city.Logical formLearned from26 sentences. A person may travel on a road.Logical formLearned from26 sentences. Road may be travelled.Logical formLearned from26 sentences. An elected-representative may travel to a country.Logical formLearned from26 sentences.