A document can be a letter.Logical formLearned from80 sentences. A letter can be to a chief.Logical formLearned from80 sentences. A letter may pertain-to a king.Logical formLearned from80 sentences. A series can be constituted-of-or-filled-with (letter bombs).Logical formLearned from79 sentences. Letters can be sealed.Logical formLearned from79 sentences. Letters may pertain-to a greek alphabet.Logical formLearned from79 sentences. Persons may have letters.Logical formLearned from79 sentences. Some senators may sign a letter.Logical formLearned from79 sentences. A letter can be from a us-state.Logical formLearned from79 sentences. Letters may pertain-to an artist.Logical formLearned from79 sentences. A letter can be monthly.Logical formLearned from79 sentences. A letter can be to students.Logical formLearned from78 sentences. A letter can be to a husband.Logical formLearned from78 sentences. A section may pertain-to a letter.Logical formLearned from78 sentences. A person can be a letter.Logical formLearned from78 sentences.