(Trained guinea pigs) may work in covert operations.Logical formLearned from9 sentences. Pigs may pertain-to a US-city.Logical formLearned from9 sentences. Pigs may undergo a loss.Logical formLearned from9 sentences. A (pig farm) may pertain-to a family.Logical formLearned from9 sentences. Pigs can be on a farm.Logical formLearned from9 sentences. A pen can be constituted-of-or-filled-with pigs.Logical formLearned from9 sentences. A pig can be unclean.Logical formLearned from9 sentences. Food can be for pigs.Logical formLearned from9 sentences. A body may pertain-to a pig.Logical formLearned from9 sentences. Pigs may be considered unclean.Logical formLearned from9 sentences. A pig may pertain-to a family.Logical formLearned from9 sentences. A pig can be stewed.Logical formLearned from9 sentences. (Pig heads) can be severed.Logical formLearned from9 sentences. Some pigs may be slaughtered as a precaution.Logical formLearned from9 sentences. (Flu viruses) may emerge from pigs.Logical formLearned from9 sentences.