A stamp can be required.Logical formLearned from15 sentences. Stamps may be needed.Logical formLearned from15 sentences. A code may put a (time stamp) on a page.Logical formLearned from15 sentences. A postal service may issue a stamp.Logical formLearned from15 sentences. A (food stamp program) may undergo an expansion.Logical formLearned from15 sentences. A (post office) may release a stamp.Logical formLearned from15 sentences. A stamp can be forged.Logical formLearned from15 sentences. A stamp may pertain-to a world-city.Logical formLearned from15 sentences. A stamp can be positive.Logical formLearned from15 sentences. A set can be constituted-of-or-filled-with some special stamps.Logical formLearned from14 sentences. A set may include some stamps.Logical formLearned from14 sentences. An official stamp can be on an inside.Logical formLearned from14 sentences. A country may issue stamps.Logical formLearned from14 sentences. A male can be (stamp dealer).Logical formLearned from14 sentences. A stamp may pertain-to a language.Logical formLearned from14 sentences.