An obstacle can be to an uniformity of interests.Logical formLearned from19 sentences. A person may have an obstacle.Logical formLearned from19 sentences. An obstacle can be to change.Logical formLearned from19 sentences. Obstacles can be in a way of economic development.Logical formLearned from19 sentences. Obstacles can be to negotiations.Logical formLearned from19 sentences. An obstacle can be to an extradition.Logical formLearned from19 sentences. Corruption can be an obstacle.Logical formLearned from19 sentences. Persons may see obstacles.Logical formLearned from19 sentences. An effort may face obstacles.Logical formLearned from19 sentences. An obstacle to the future can be that something-is-the-case.Logical formLearned from19 sentences. Settlements can be an obstacle to peace.Logical formLearned from19 sentences. A country may remove obstacles.Logical formLearned from19 sentences. A reminder may pertain-to obstacles.Logical formLearned from19 sentences. An obstacle can be before a (weekend visit).Logical formLearned from19 sentences. A network can be constituted-of-or-filled-with obstacles.Logical formLearned from19 sentences.