Since the order is not important, we can represent each outcome as an ordered pair $(a,b)$ where $a$ and $b$ are the numbers on the two slips and $a<b$. The set of all possible outcomes is $S=\{(1,2),(1,3),(1,4),(1,5),(2,3),(2,4),(2,5),(3,4),(3,5),(4,5)\}$.
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