A (litter tray) may pertain-to a cat.Logical formLearned from11 sentences. A member may pertain-to a litter.Logical formLearned from11 sentences. A litter can be invalid.Logical formLearned from10 sentences. A litter can be heavy.Logical formLearned from10 sentences. A litter can be covered.Logical formLearned from10 sentences. A litter can be urban.Logical formLearned from10 sentences. A litter can be unsightly.Logical formLearned from10 sentences. Levels can be constituted-of-or-filled-with litter.Logical formLearned from10 sentences. A (kitty litter) may pertain-to a person.Logical formLearned from10 sentences. A bomb can be in regard to litter.Logical formLearned from10 sentences. Kinds may attack a litter.Logical formLearned from10 sentences. Cooperation can be with a (touching litter).Logical formLearned from10 sentences. A litter can be in association.Logical formLearned from10 sentences. Themselves may colligate a litter.Logical formLearned from10 sentences. (Nyc winters) can be a litter.Logical formLearned from10 sentences.