Now they say that

There’s no rhyme for silver,

And they say that

There’s no rhyme for orange,

But I’ve petted

A bleating young chilver,

And in high school

I studied a sporange.

So they say that

What is often isn’t,

And they say that

What isn’t often is,

So I guess that

What isn’t isn’t isn’t,

And what is isn’t

Is isn’t is.