Thinking of a birthday may come_up.Logical formLearned from25 sentences. Persons may undergo birthdays.Logical formLearned from25 sentences. A person may make a (birthday cake).Logical formLearned from25 sentences. A birthday can be said.Logical formLearned from25 sentences. A (birthday card) can be spiffy.Logical formLearned from25 sentences. A (birthday cake) can be for a female.Logical formLearned from25 sentences. Pictures may show a (birthday party).Logical formLearned from25 sentences. A person may know birthdays.Logical formLearned from25 sentences. A (birthday celebration) can be in a US-city.Logical formLearned from25 sentences. Persons may have birthdays.Logical formLearned from25 sentences. A birthday can be sad.Logical formLearned from25 sentences. A male may call a person on a birthday.Logical formLearned from25 sentences. A (birthday party) may pertain-to a president.Logical formLearned from25 sentences. A birthday may pertain-to a professor.Logical formLearned from25 sentences. A person can be a birthday.Logical formLearned from25 sentences.