Segregation by class is something this country already has a problem with!

We'll eliminate them all by groups and classes until we're left with only one person.

The new system totally integrated the schools by race and social class for the first time.

Many of them group drugs by classes to make this easier.

The duration of these effects varies by class and level.

Then there are distinctions by class - length, for one.

What's more, the kinds of words and statements that children heard varied by class.

Well I was going to ask you that, what you meant by class.

"I try to go by classes of products," he said, "if it is not meant for use in the park."

And you should group materials by classes, with a separate compartment for each.