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FOr those who don't understand it. Try this.

Take a deck of cards, hold it in your left or right hand with the deck parallel to the table. Now "roll" your hand like you are turning a door knob.

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For those who don't understand how this exposes cards try this.

Hold the deck as Photoc told you and push the top card forward (or backward or to the left) so that it overhangs the deck. now with that card overhanging the deck rotate the the whole deck the way Photoc described.