A search can be fruitless.Logical formLearned from878 sentences. Negotiations can be fruitless.Logical formLearned from479 sentences. Talks can be fruitless.Logical formLearned from474 sentences. Attempts can be fruitless.Logical formLearned from403 sentences. Efforts can be fruitless.Logical formLearned from383 sentences. An effort can be fruitless.Logical formLearned from313 sentences. Efforts can be fruitless.Logical formLearned from299 sentences. An attempt can be fruitless.Logical formLearned from281 sentences. A search can be fruitless.Logical formLearned from208 sentences. An exercise can be fruitless.Logical formLearned from161 sentences. A quest can be fruitless.Logical formLearned from156 sentences. Efforts can be fruitless.Logical formLearned from150 sentences. Searchings can be fruitless.Logical formLearned from149 sentences. Searches can be fruitless.Logical formLearned from141 sentences. A search may prove fruitless.Logical formLearned from122 sentences.