sentences: mammals give birth to live young & monkeys give birth to live young ->  a monkey is a kind of mammal  mammals give birth to live young & bats give birth to live young ->  a bat is a kind of mammal  mammals give birth to live young & mice give birth to live young ->  a mouse is a kind of mammal  a monkey is a kind of mammal & a bat is a kind of mammal & a mouse is a kind of mammal -> mouse, monkey, and bat are all mammals