Imagine that every day you walk along the beach and collect stones into backpack. Short-term memory.
But your collection should only contain unique stones! So, also every day, you sit down and compare new stones to old ones. Dreams.
After selecting most unique and beautiful (repetition and emotion) stones you place them in a small purse. Long-term memory.
Since you very often compare new stones with old ones, almost always leaving an old ones and throwing away similar ones, you very well know what exactly and where lays in the purse. Being able to pull out familiar stones very quickly. Fluid reasoning.
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