Questions can be open-ended.Logical formLearned from57 sentences. A problem can be open-ended.Logical formLearned from57 sentences. Commitments can be open-ended.Logical formLearned from54 sentences. An (impeachment inquiry) can be open-ended.Logical formLearned from54 sentences. Talks can be open-ended.Logical formLearned from53 sentences. A curfew can be open-ended.Logical formLearned from51 sentences. A system can be open-ended.Logical formLearned from50 sentences. An invitation can be open-ended.Logical formLearned from50 sentences. A general strike can be open-ended.Logical formLearned from50 sentences. An exploration can be open-ended.Logical formLearned from49 sentences. Tasks can be open-ended.Logical formLearned from49 sentences. Discussions can be open-ended.Logical formLearned from48 sentences. A format can be open-ended.Logical formLearned from48 sentences. A period can be open-ended.Logical formLearned from46 sentences. A play can be open-ended.Logical formLearned from46 sentences.