Obstacles can be to cooperation.Logical formLearned from42 sentences. Obstacles can be to reform.Logical formLearned from42 sentences. Obstacles can be great.Logical formLearned from42 sentences. A person may encounter obstacles.Logical formLearned from42 sentences. An obstacle can be to progress.Logical formLearned from42 sentences. An obstacle may pertain-to a country.Logical formLearned from42 sentences. Obstacles can be to a development.Logical formLearned from41 sentences. An obstacle can be stubborn.Logical formLearned from41 sentences. Obstacles may lie.Logical formLearned from41 sentences. An obstacle can be to growth.Logical formLearned from41 sentences. An obstacle can be practical.Logical formLearned from41 sentences. Obstacles can be in a road.Logical formLearned from41 sentences. Obstacles can be in lives.Logical formLearned from41 sentences. An obstacle can be to an accomplishment of purposes of a legislature.Logical formLearned from41 sentences. An obstacle can be to a person.Logical formLearned from41 sentences.