An obstacle can be unsurmountable.Logical formLearned from25 sentences. Obstacles can be entrenched.Logical formLearned from25 sentences. An obstacle can be in a fight.Logical formLearned from24 sentences. An obstacle can be effective.Logical formLearned from24 sentences. An obstacle can be in a quest.Logical formLearned from24 sentences. Obstacles can be solid.Logical formLearned from24 sentences. Obstacles can be to education.Logical formLearned from24 sentences. An obstacle can be to investment.Logical formLearned from24 sentences. Obstacles can be strong.Logical formLearned from24 sentences. Obstacles can be operational.Logical formLearned from24 sentences. An obstacle can be true.Logical formLearned from24 sentences. An obstacle can be strong.Logical formLearned from24 sentences. A br23c may avoid obstacles.Logical formLearned from24 sentences. A (security pact) may face obstacles.Logical formLearned from24 sentences. An obstacle can be to reunification.Logical formLearned from24 sentences.