Sets Notation
There is a fairly simple notation for sets. You simply list each element, separated by a comma, and then put some curly brackets around the whole thing.
The curly brackets { } are sometimes called "set brackets" or "braces".
{socks, shoes, watches, shirts, ...}
{index, middle, ring, pinky}
The three dots ... are called an ellipsis, and mean "continue on".
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