An issue can be thorny.Logical formLearned from5 140 sentences. Issues can be thorny.Logical formLearned from3 663 sentences. A question can be thorny.Logical formLearned from897 sentences. A problem can be thorny.Logical formLearned from888 sentences. Problems can be thorny.Logical formLearned from600 sentences. Questions can be thorny.Logical formLearned from547 sentences. Bushes can be thorny.Logical formLearned from221 sentences. A subject can be thorny.Logical formLearned from209 sentences. A dispute can be thorny.Logical formLearned from152 sentences. A topic can be thorny.Logical formLearned from139 sentences. A path can be thorny.Logical formLearned from120 sentences. Relations can be thorny.Logical formLearned from118 sentences. Political issues can be thorny.Logical formLearned from96 sentences. Negotiations can be thorny.Logical formLearned from96 sentences. Branches can be thorny.Logical formLearned from93 sentences.