Obstacles can be unexpected.Logical formLearned from162 sentences. Obstacles can be to peace.Logical formLearned from157 sentences. An obstacle can be to relations.Logical formLearned from157 sentences. Obstacles can be personal.Logical formLearned from152 sentences. Obstacles may pertain-to persons.Logical formLearned from151 sentences. Obstacles may undergo a removal.Logical formLearned from149 sentences. An obstacle can be that something-is-the-case.Logical formLearned from143 sentences. An obstacle can be to efforts.Logical formLearned from143 sentences. Obstacles can be technological.Logical formLearned from133 sentences. A host can be constituted-of-or-filled-with obstacles.Logical formLearned from132 sentences. An obstacle can be insuperable.Logical formLearned from129 sentences. A male may face obstacles.Logical formLearned from127 sentences. An obstacle may be removed.Logical formLearned from126 sentences. Obstacles can be overwhelming.Logical formLearned from126 sentences. Obstacles can be artificial.Logical formLearned from123 sentences.