Workers may pay contributions.Logical formLearned from16 sentences. A contribution can be to earnings.Logical formLearned from16 sentences. A contribution may pertain-to an international community.Logical formLearned from16 sentences. Some (dollar contribution) can be proper.Logical formLearned from16 sentences. Some (dollar contribution) can be from a couple.Logical formLearned from16 sentences. A contribution can be necessary.Logical formLearned from16 sentences. A set can be constituted-of-or-filled-with contributions.Logical formLearned from15 sentences. A contribution can be to an improvement.Logical formLearned from15 sentences. Contributions can be in fields.Logical formLearned from15 sentences. Contributions can be to a friendship.Logical formLearned from15 sentences. A contribution may pertain-to a couple.Logical formLearned from15 sentences. Contributions can be to protection of an environment.Logical formLearned from15 sentences. A contribution can be to a development of a country.Logical formLearned from15 sentences. Contributions can be to a journal.Logical formLearned from15 sentences. Contributions can be popular.Logical formLearned from15 sentences.