Obstacles can be to unity.Logical formLearned from11 sentences. An obstacle can be in a search.Logical formLearned from11 sentences. An obstacle can be to plans.Logical formLearned from11 sentences. Obstacles may mean that something-is-the-case.Logical formLearned from11 sentences. An obstacle can be unbeatable.Logical formLearned from11 sentences. An obstacle can be heavy.Logical formLearned from11 sentences. Obstacles can be in the future.Logical formLearned from11 sentences. An obstacle can be to changes.Logical formLearned from11 sentences. An obstacle can be surmountable.Logical formLearned from11 sentences. Some obstacles can be to an action.Logical formLearned from11 sentences. Workers may face obstacles.Logical formLearned from11 sentences. An obstacle may be costed.Logical formLearned from11 sentences. Obstacles can be to communication.Logical formLearned from11 sentences. An obstacle can be in regard.Logical formLearned from11 sentences. Persons may face obstacles.Logical formLearned from11 sentences.