Materials can be stiff.Logical formLearned from30 sentences. A person may sit stiff.Logical formLearned from30 sentences. A figure can be stiff.Logical formLearned from30 sentences. Sheets can be stiff.Logical formLearned from30 sentences. A person may look stiff.Logical formLearned from30 sentences. A letter can be stiff.Logical formLearned from30 sentences. Warnings can be stiff.Logical formLearned from30 sentences. A female may go stiff.Logical formLearned from29 sentences. A suspension can be stiff.Logical formLearned from29 sentences. ..s can be stiff.Logical formLearned from29 sentences. A face can be stiff.Logical formLearned from29 sentences. Backs can be stiff.Logical formLearned from29 sentences. A crosswind can be stiff.Logical formLearned from29 sentences. A right can be stiff.Logical formLearned from29 sentences. Tests can be stiff.Logical formLearned from28 sentences.