Let ε < 0.

There are three kinds of people in the world: those who can count and those who can’t.
– George Carlin

There are two groups of people in the world: those who believe that the world can be divided into two groups of people, and those who don’t.

There are two groups of people in the world: those who can be categorized into one of two groups of people, and those who can’t.

There are two groups of people in the world: those that don’t do math, and those that take care of them.

There are three kinds of people in the world: them that aren’t good at math and them that aren’t goof at English.

There are 10 groups of people in the world: those who understand binary, and those who don’t.

There are only 10 types of people in the world: those who understand trinary, those who don’t, and those who mistake it for binary.