Some planes may return to a base.Logical formLearned from21 sentences. A country may establish a military base.Logical formLearned from21 sentences. Buildings can be at a base.Logical formLearned from21 sentences. A male may cover first base.Logical formLearned from21 sentences. An island may be used as a base.Logical formLearned from21 sentences. Bases may pertain-to a (guerrilla group).Logical formLearned from21 sentences. A raid can be on a base.Logical formLearned from21 sentences. Bases can be rent-free.Logical formLearned from21 sentences. Home can be to a (naval base).Logical formLearned from21 sentences. Military bases can be isolated.Logical formLearned from21 sentences. A main base can be for troops.Logical formLearned from21 sentences. Troops can be from a base.Logical formLearned from21 sentences. A (suicide bombing) can be at a base.Logical formLearned from21 sentences. Persons may have an industrial base.Logical formLearned from21 sentences. A (power base) may pertain-to a country.Logical formLearned from21 sentences.