A regret can be sad.Logical formLearned from17 sentences. A tree can be sad.Logical formLearned from17 sentences. A phase can be sad.Logical formLearned from17 sentences. A gesture can be sad.Logical formLearned from17 sentences. A fan can be sad.Logical formLearned from17 sentences. A daughter can be sad.Logical formLearned from17 sentences. A specimen can be sad.Logical formLearned from17 sentences. A wisdom can be sad.Logical formLearned from17 sentences. A garden can be sad.Logical formLearned from17 sentences. Rain can be sad.Logical formLearned from17 sentences. Puppies can be sad.Logical formLearned from17 sentences. Noise can be sad.Logical formLearned from17 sentences. A princess can be sad.Logical formLearned from17 sentences. (That persons) can be sad.Logical formLearned from17 sentences. A person can be sad as hell.Logical formLearned from17 sentences.