Letters may pertain-to an alphabet.Logical formLearned from682 sentences. A male may say in a letter.Logical formLearned from681 sentences. A letter can be congratulatory.Logical formLearned from672 sentences. A date may pertain-to a letter.Logical formLearned from665 sentences. A letter can be constituted-of-or-filled-with interest.Logical formLearned from651 sentences. A letter can be certified.Logical formLearned from644 sentences. A male may write a letter.Logical formLearned from632 sentences. A letter may note that something-is-the-case.Logical formLearned from628 sentences. A person may write letters.Logical formLearned from625 sentences. Receipt may pertain-to a letter.Logical formLearned from625 sentences. A letter can be nice.Logical formLearned from623 sentences. A letter can be to shareholders.Logical formLearned from616 sentences. A letter can be to a friend.Logical formLearned from604 sentences. A letter can be from a person.Logical formLearned from601 sentences. A person may get letters.Logical formLearned from600 sentences.