A person may run into obstacles.Logical formLearned from36 sentences. A world-city may set obstacles.Logical formLearned from36 sentences. Obstacles may abound.Logical formLearned from36 sentences. Persons may put obstacles.Logical formLearned from36 sentences. An obstacle can be regulatory.Logical formLearned from36 sentences. An obstacle can be to efforts.Logical formLearned from36 sentences. Persons may overcome an obstacle.Logical formLearned from36 sentences. A plan may face obstacles.Logical formLearned from35 sentences. Obstacles can be to economic development.Logical formLearned from35 sentences. Settlements can be an obstacle to peace.Logical formLearned from35 sentences. An obstacle can be to aspirations.Logical formLearned from35 sentences. Obstacles can be systemic.Logical formLearned from35 sentences. Persons may face some obstacles.Logical formLearned from35 sentences. Persons can be an obstacle.Logical formLearned from35 sentences. Some obstacles can be to peace.Logical formLearned from34 sentences.