Backgammon players never play checkers, because they do not find checkers challenging. Therefore, Wendy must understand chess strategy. All chess players understand chess strategy. Backgammon is more challenging than checkers. All students who understand chess strategy play chess.
Chess is more challenging than backgammon.
All students who find backgammon challenging play checkers. As any economist knows, healthy people pose less of an economic burden to society than unhealthy people. Not surprisingly, then, every dollar our state government spends on prenatal care for undocumented immigrants will save taxpayers of this state three dollars. The state's taxpayers pay for prenatal care of all immigrants. Babies whose mothers did not receive prenatal care are just as healthy as other babies.