Some workers may be infected with a virus.Logical formLearned from2 sentences. Two-thirds of prostitutes may be infected with a virus.Logical formLearned from2 sentences. A disease may infect some percent of prostitutes.Logical formLearned from2 sentences. Cows may be infected with a mad disease.Logical formLearned from2 sentences. Singaporeans may be infected with a virus.Logical formLearned from2 sentences. Tuberculosis may infect others.Logical formLearned from2 sentences. A male may be infected by some patient.Logical formLearned from2 sentences. Viruses may infect ancestors of pigs.Logical formLearned from2 sentences. A mother may be infected with a neurological disease.Logical formLearned from2 sentences. (Street children) may be infected with a virus.Logical formLearned from2 sentences. A butcher may be infected from beef.Logical formLearned from2 sentences. Corruption may infect a world-city.Logical formLearned from2 sentences. (Blood plasma donors) may be infected with a virus.Logical formLearned from2 sentences. Some hemophiliacs may be infected with blood.Logical formLearned from2 sentences. Bacteria may infect some patients.Logical formLearned from2 sentences.