Spans can be constituted-of-or-filled-with some years.Logical formLearned from4 sentences. An (attention span) can be fragmented.Logical formLearned from4 sentences. A span can be on earth.Logical formLearned from4 sentences. A span may be allocated for a child.Logical formLearned from4 sentences. Spans can be lengthy.Logical formLearned from4 sentences. An estimate may pertain-to a span.Logical formLearned from4 sentences. Some percent can be during a span.Logical formLearned from4 sentences. (Calorie restriction) may extend (life span).Logical formLearned from4 sentences. A span can be constituted-of-or-filled-with development.Logical formLearned from4 sentences. Mutations may extend (life span).Logical formLearned from4 sentences. A (life span) may increase by some years.Logical formLearned from4 sentences. (Time spans) can be varying.Logical formLearned from4 sentences. A (life span) can be expanded.Logical formLearned from4 sentences. A course may pertain-to a span.Logical formLearned from4 sentences. (Attention spans) may pertain-to young persons.Logical formLearned from4 sentences.