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In fact, it's now infinite.
I can reapply this subject goes to subject rule
as many times as I want.
Students and students and students and teachers think.
And if someone were to challenge me and say,
"Oh, there are only 5 strings in your grammar,"
I could always make a new one by using this rule
one more time, so for any number you might think are produced,
I can always get 1 more, so the number of potential strings I can produce is infinite.
That's a huge amount of scope for creativity.