An obstacle can be for someone.Logical formLearned from12 sentences. Obstacles can be onerous.Logical formLearned from12 sentences. An obstacle can be to unity.Logical formLearned from12 sentences. An obstacle can be a need.Logical formLearned from12 sentences. Obstacles can be opportunities.Logical formLearned from12 sentences. An obstacle can be to an expansion.Logical formLearned from12 sentences. Obstacles may be surmounted.Logical formLearned from12 sentences. Obstacles can be to learning.Logical formLearned from12 sentences. Obstacles may prevent (troop deployment) to a country.Logical formLearned from12 sentences. Obstacles can be to (peace efforts).Logical formLearned from12 sentences. A country may remove some obstacles.Logical formLearned from12 sentences. Obstacles can be to a solution.Logical formLearned from12 sentences. A vote may remove an obstacle to an offensive.Logical formLearned from12 sentences. Funds can be an obstacle.Logical formLearned from12 sentences. A refusal can be an obstacle.Logical formLearned from12 sentences.