Efforts may prove fruitless.Logical formLearned from112 sentences. An endeavor can be fruitless.Logical formLearned from108 sentences. Years can be fruitless.Logical formLearned from103 sentences. Attempts can be fruitless.Logical formLearned from97 sentences. Efforts may prove fruitless.Logical formLearned from95 sentences. A hunt can be fruitless.Logical formLearned from95 sentences. Attempts may prove fruitless.Logical formLearned from90 sentences. A meeting can be fruitless.Logical formLearned from90 sentences. A pursuit can be fruitless.Logical formLearned from88 sentences. Discussions can be fruitless.Logical formLearned from74 sentences. Negotiations may prove fruitless.Logical formLearned from70 sentences. A day can be fruitless.Logical formLearned from68 sentences. A search may prove fruitless.Logical formLearned from67 sentences. Days can be fruitless.Logical formLearned from67 sentences. Attempts can be fruitless.Logical formLearned from65 sentences.