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You said, with regards to memorization, in your OP:

"I'm convinced anyone can do this and the major thing stopping them is their belief that they can't do it."

If you want to now adjust that claim and say "some can do it", you better be able to tell us how to distinguish.

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Oh you're just being so silly now. Here is my original comment:

I'm convinced anyone can do this and the major thing stopping them is their belief that they can't do it.

Here is how I am comfortable revising it for the offended sticklers in this thread:

I'm convinced anyone (of typical mental capacity) can do this and the major thing stopping them is their belief that they can't do it.

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I'm asking you to be rigorous with your claims. And there's nothing wrong with being pedantic.

If you can't respond to questions without getting defensive, please grow up.