A birthday may fall on a month.Logical formLearned from45 sentences. A birthday may pertain-to brother.Logical formLearned from45 sentences. A birthday can be in some months.Logical formLearned from45 sentences. Children may undergo birthdays.Logical formLearned from45 sentences. A birthday can be a birthday.Logical formLearned from45 sentences. A birthday may pertain-to a sister-in-law.Logical formLearned from45 sentences. A month can be (birthday month).Logical formLearned from45 sentences. A person may sing birthday.Logical formLearned from45 sentences. A birthday may pertain-to son.Logical formLearned from45 sentences. A person may throw a (birthday party).Logical formLearned from45 sentences. A birthday can be to a male.Logical formLearned from45 sentences. A female can be for a birthday.Logical formLearned from45 sentences. A birthday may pertain-to a pope.Logical formLearned from45 sentences. Some holiday may occur on a birthday.Logical formLearned from45 sentences. A week can be shy of a birthday.Logical formLearned from45 sentences.