If you understand, say "understand".
If you don't understand, say "don't understand".
But if you understand and say "don't understand".
How do I understand that you understand? Understand!
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I thought a thought.
But the thought I thought wasn't the thought I thought I thought.
If the thought I thought I thought had been the thought I thought, I wouldn't have thought so much.
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If one doctor doctors another doctor does the doctor who doctors the doctor doctor the doctor the way the doctor he is doctoring doctors? Or does the doctor doctor the way the doctor who doctors doctors?

Here's the answer:
The doctoring doctor doctors the doctor the way the
doctoring doctor wants to doctor the doctor.
Not the way the doctored doctor wants to be doctored