Text: As described above, many alien farmworkers may have a home base in Mexico as commuter aliens or as special agricultural workers who travel through the migrant stream around the United States and return to Mexico during periods of unemployment.
Entailment: Migrant farmworkers often commute from their homes in Mexico where they live when there is no work for them.
Contradiction: Once a migrant worker from Mexico enters the country, that person never returns to his home country.