A person may sit_in on piano.Logical formLearned from2 sentences. A reporter may sit_in on a (court session).Logical formLearned from2 sentences. Persons may sit_in as a male.Logical formLearned from2 sentences. A female may sit_in with a band.Logical formLearned from2 sentences. A male may sit_in on some songs.Logical formLearned from2 sentences. A female may sit_in on (trade talks).Logical formLearned from2 sentences. A political adviser may sit_in on meetings.Logical formLearned from2 sentences. Diplomats may sit_in on talks.Logical formLearned from2 sentences. Corporate executives may sit_in on meetings of an (energy task force).Logical formLearned from2 sentences. A male may sit_in on sessions.Logical formLearned from2 sentences. A secretary of labor may sit_in on negotiations.Logical formLearned from2 sentences. A female may sit_in on a hearing.Logical formLearned from2 sentences. A colleague may sit_in on (pardon discussions).Logical formLearned from2 sentences. A person may sit_in on a (planning session).Logical formLearned from2 sentences. Persons may sit_in on sessions.Logical formLearned from2 sentences.