Persons may suppose obstacles.Logical formLearned from20 sentences. Persons may encounter obstacles.Logical formLearned from20 sentences. Life can be full of obstacles.Logical formLearned from20 sentences. Obstacles can be to education.Logical formLearned from20 sentences. Dozens can be constituted-of-or-filled-with obstacles.Logical formLearned from20 sentences. An obstacle can be to implementation.Logical formLearned from20 sentences. An obstacle can be to economic progress.Logical formLearned from20 sentences. An obstacle can be to a development of relations.Logical formLearned from20 sentences. A political-leader can be an obstacle to peace.Logical formLearned from20 sentences. An obstacle can be to getting.Logical formLearned from20 sentences. A country may raise obstacles.Logical formLearned from20 sentences. An obstacle can be in a road.Logical formLearned from20 sentences. A string can be constituted-of-or-filled-with obstacles.Logical formLearned from20 sentences. Obstacles can be to membership.Logical formLearned from20 sentences. An obstacle can be to a process of democratization.Logical formLearned from20 sentences.