A (research group) may pertain-to persons.Logical formLearned from584 sentences. Director may pertain-to a group.Logical formLearned from583 sentences. A person may head a group.Logical formLearned from582 sentences. A members may pertain-to a group.Logical formLearned from582 sentences. A group can be republican.Logical formLearned from581 sentences. A purpose may pertain-to a group.Logical formLearned from581 sentences. A group can be difficult.Logical formLearned from580 sentences. Some ethnic groups can be in a country.Logical formLearned from580 sentences. A group may pertain-to a language.Logical formLearned from580 sentences. A group can be constituted-of-or-filled-with some soldiers.Logical formLearned from580 sentences. A group can be constituted-of-or-filled-with physicians.Logical formLearned from579 sentences. A group may undergo a creation.Logical formLearned from578 sentences. A group can be constituted-of-or-filled-with buildings.Logical formLearned from576 sentences. A group may argue that something-is-the-case.Logical formLearned from576 sentences. Members can be constituted-of-or-filled-with ethnic groups.Logical formLearned from575 sentences.