An obstacle can be on tracks.Logical formLearned from8 sentences. Obstacles can be in a path of progress.Logical formLearned from8 sentences. Obstacles can be sudden.Logical formLearned from8 sentences. Obstacles can be to realizing potential.Logical formLearned from8 sentences. An election of a president may put an obstacle to (gun control legislation).Logical formLearned from8 sentences. Obstacles can be to a life.Logical formLearned from8 sentences. Obstacles may be faced by someone.Logical formLearned from8 sentences. Obstacles can be to equality.Logical formLearned from8 sentences. Obstacles can be efforts.Logical formLearned from8 sentences. Obstacles can be to a recovery.Logical formLearned from8 sentences. An obstacle may loom.Logical formLearned from8 sentences. An obstacle can be to reunion.Logical formLearned from8 sentences. A story may be filled with obstacles to an affair.Logical formLearned from8 sentences. Obstacles can be to an affair.Logical formLearned from8 sentences. A person may understand obstacles.Logical formLearned from8 sentences.