Volunteers can be uninfected.Logical formLearned from19 sentences. Cows can be uninfected.Logical formLearned from18 sentences. Adults can be uninfected.Logical formLearned from17 sentences. Babies can be uninfected.Logical formLearned from17 sentences. An individual can be uninfected.Logical formLearned from17 sentences. Mosquitoes can be uninfected.Logical formLearned from16 sentences. Trees can be uninfected.Logical formLearned from15 sentences. Infants can be uninfected.Logical formLearned from15 sentences. Humans can be uninfected.Logical formLearned from14 sentences. Controls can be uninfected.Logical formLearned from14 sentences. A computer can be uninfected.Logical formLearned from13 sentences. Mice can be uninfected.Logical formLearned from13 sentences. Hens can be uninfected.Logical formLearned from12 sentences. A female can be uninfected.Logical formLearned from12 sentences. A human can be uninfected.Logical formLearned from12 sentences.