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<title>Sets and bags</title>
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<h1>SRFI 113: Sets and bags</h1>
<p class="authors">by John Cowan</p>
<p class="based-on"></p>
<p class="status">status: <em>final</em> (2014-11-28)</p>
<p class="keywords">keywords: <a href="https://srfi.schemers.org/?keywords=data-structure">Data Structure</a>, <a href="https://srfi.schemers.org/?keywords=r7rs-large">R7RS Large</a>, <a href="https://srfi.schemers.org/?keywords=r7rs-large-red">R7RS Large: Red Edition</a></p><span class="see-also">See also <a href="/srfi-217/">SRFI 217: Integer Sets</a>.</span>
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<h2>Abstract</h2> <p><em>Sets</em> and <em>bags</em> (also known as
multisets) are unordered collections that can contain any Scheme object.
Sets enforce the constraint that no two elements can be the same in the
sense of the set's associated <em>equality predicate</em>; bags do
not.</body></html>