Variability can be in (mat nitrogen fixation).Logical formLearned from2 sentences. (Floor mats) may be removed from a hallway.Logical formLearned from2 sentences. Mats can be in a hallway.Logical formLearned from2 sentences. A male may reach under a (floor mat) of a car.Logical formLearned from2 sentences. A (floor mat) may pertain-to a car.Logical formLearned from2 sentences. Mats can be wavy.Logical formLearned from2 sentences. Mud may be covered with mats of hay.Logical formLearned from2 sentences. Mats can be constituted-of-or-filled-with hay.Logical formLearned from2 sentences. A mat can be constituted-of-or-filled-with microbes.Logical formLearned from2 sentences. Microbial mats can be thick.Logical formLearned from2 sentences. Fibers may form a mat.Logical formLearned from2 sentences. A mat can be absorbent.Logical formLearned from2 sentences. A (discharge mat) can be static.Logical formLearned from2 sentences. A mat may undergo postings.Logical formLearned from2 sentences. A person may have an (activity mat).Logical formLearned from2 sentences.