An obstacle can be for some parties.Logical formLearned from6 sentences. An obstacle can be to getting a bill.Logical formLearned from6 sentences. A paper may examine obstacles.Logical formLearned from6 sentences. An obstacle can be for relations.Logical formLearned from6 sentences. Time can be an obstacle.Logical formLearned from6 sentences. An obstacle can be to international trade.Logical formLearned from6 sentences. An obstacle can be invincible.Logical formLearned from6 sentences. Obstacle can be to peace.Logical formLearned from6 sentences. Obstacles can be to a realization.Logical formLearned from6 sentences. An obstacle can be (language barrier).Logical formLearned from6 sentences. An obstacle can be to agencies.Logical formLearned from6 sentences. Obstacles can be to achieving a goal.Logical formLearned from6 sentences. Parents may face obstacles.Logical formLearned from6 sentences. Obstacles can be to an achievement.Logical formLearned from6 sentences. A person may place an obstacle.Logical formLearned from6 sentences.