An erection can be painful.Logical formLearned from17 sentences. (Leg cramps) can be painful.Logical formLearned from17 sentences. Hemorrhoids can be painful.Logical formLearned from17 sentences. A betrayal can be painful.Logical formLearned from17 sentences. Knots can be painful.Logical formLearned from17 sentences. A contrast can be painful.Logical formLearned from17 sentences. (Knee osteoarthritis) can be painful.Logical formLearned from17 sentences. A death can be painful.Logical formLearned from17 sentences. Contradictions can be painful.Logical formLearned from17 sentences. An arm can be painful.Logical formLearned from17 sentences. Separation can be painful.Logical formLearned from17 sentences. Gums can be painful.Logical formLearned from17 sentences. Hits can be painful.Logical formLearned from17 sentences. A marriage can be painful.Logical formLearned from17 sentences. Care can be painful.Logical formLearned from17 sentences.