To calculate the number of duplicated items, players can use the following formula: $$y = x * n$$, where $y$ is the total number of duplicated items, $x$ is the number of original items, and $n$ is the number of copies to make. For example, if a player has 5 items and wants to make 3 copies of each item, the total number of duplicated items would be: $$y = 5 * 3 = 15$$.
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