Collisions can be with obstacles.Logical formLearned from18 sentences. Obstacles can be to a plan.Logical formLearned from18 sentences. Obstacles can be to a process.Logical formLearned from18 sentences. Fear can be an obstacle.Logical formLearned from18 sentences. Obstacles can be to adoption.Logical formLearned from18 sentences. Obstacles can be overwhelming.Logical formLearned from18 sentences. A person can be an obstacle to a person.Logical formLearned from18 sentences. An obstacle can be to statehood.Logical formLearned from18 sentences. Obstacles can be tricky.Logical formLearned from18 sentences. Obstacles can be immovable.Logical formLearned from18 sentences. An obstacle can be to improving health.Logical formLearned from18 sentences. An obstacle can be inconvenient.Logical formLearned from18 sentences. Obstacles can be high.Logical formLearned from18 sentences. Obstacles can be deep-rooted.Logical formLearned from18 sentences. An obstacle can be to a mission.Logical formLearned from18 sentences.