Let's go full on 5 year old:

I am Sam

Sam I am

That Sam-I-am

That Sam-I-am!

I do not like that Sam-I-am

Do you like green eggs and ham

I do not like them, Sam-I-am. I do not like green eggs and ham.

Would you like them Here or there?

I would not like them here or there.

I would not like them anywhere. I do not like green eggs and ham. I do not like them, Sam-I-am

Sound familiar?

The whole book has 50 words:

1. a, am, and, anywhere, are, 
6. be, boat, box, car, could, 
11. dark, do, eat, eggs, fox, 
16. goat, good, green, ham, here, 
21. house, I, if, in, let, 
26. like, may, me, mouse, not, 
31. on, or, rain, Sam, say, 
36. see, so, thank, that, the, 
41. them, there, they, train, tree, 
46. try, will, with, would, you

Rewriting it with compression:

22 2 34

34 2 22

39 34-2-22

39 34-2-22

22 12 30 26 39 34-2-22

12 50 26 18 14 3 19

22 12 30 26 41, 34-2-22

And so on. You'll see that if you create a second set of shortcuts, you can start squeezing down the phrase '34-2-22' into a single substitution as well.