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Mnemonic devices work so long as you have them actively in your mind, which means that you probably can't manage that many of them at one time. The more you practice with them, the more second nature they become. Also, personalize it. Find a way to make it apply to you. Tell a story problem in terms of yourself, your friends, your world, or your existence. The more that it makes you laugh, the more likely it is going to stick.
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