A male may double a (life span) of (fruit flies).Logical formLearned from6 sentences. (Life spans) can be varying.Logical formLearned from6 sentences. (Attention span) may undergo tests.Logical formLearned from6 sentences. (Attention spans) may be amused.Logical formLearned from6 sentences. (Life spans) may pertain-to armadillos.Logical formLearned from6 sentences. Persons may live a (life span).Logical formLearned from6 sentences. (Life spans) may drive a trend.Logical formLearned from6 sentences. A span can be constituted-of-or-filled-with products.Logical formLearned from6 sentences. Spans may connect a defense-department with patrons.Logical formLearned from6 sentences. A span can be constituted-of-or-filled-with space.Logical formLearned from6 sentences. Wings may unfold to a span of some feet.Logical formLearned from6 sentences. An (attention span) of (war correspondents) can be long.Logical formLearned from6 sentences. An (attention span) may pertain-to a US-city.Logical formLearned from6 sentences. A (life span) of cells can be known.Logical formLearned from6 sentences. An average (life span) of a person can be years.Logical formLearned from6 sentences.