Cost can be an obstacle.Logical formLearned from34 sentences. Obstacles may appear.Logical formLearned from34 sentences. Obstacles can be hidden.Logical formLearned from34 sentences. An obstacle can be to an ability.Logical formLearned from34 sentences. An obstacle can be persistent.Logical formLearned from34 sentences. An obstacle can be to peacemakings.Logical formLearned from34 sentences. Obstacles can be unjustified.Logical formLearned from34 sentences. Persons may overcome obstacles.Logical formLearned from34 sentences. An obstacle can be to integration.Logical formLearned from33 sentences. Obstacles can be unanticipated.Logical formLearned from33 sentences. An obstacle can be to participation.Logical formLearned from33 sentences. A person may overcome an obstacle.Logical formLearned from33 sentences. Obstacles can be to learning.Logical formLearned from33 sentences. Obstacles can be to relations.Logical formLearned from33 sentences. Obstacles can be to an agreement.Logical formLearned from33 sentences.