Contributions can be lifelong.Logical formLearned from124 sentences. Contributions can be to the world.Logical formLearned from123 sentences. A contribution can be to research.Logical formLearned from123 sentences. A contribution can be regular.Logical formLearned from123 sentences. Contributions can be to a program.Logical formLearned from122 sentences. A contribution can be to efforts.Logical formLearned from122 sentences. Persons may make contributions.Logical formLearned from122 sentences. A contribution can be to a discussion.Logical formLearned from121 sentences. A contribution can be sustained.Logical formLearned from121 sentences. A contribution can be to a (product line).Logical formLearned from121 sentences. A contribution can be to arts.Logical formLearned from121 sentences. A contribution can be timely.Logical formLearned from120 sentences. A contribution can be combined.Logical formLearned from120 sentences. A contribution can be to a genre.Logical formLearned from120 sentences. A contribution can be one-time.Logical formLearned from120 sentences.