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<div style="position:fixed;left:0;top:0">
[[File:coinslot.png|link=]]
</div>
<div style="top: 300px; left: 0px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
</div>
<div style="top: 600px; left: 0px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
</div>
<div style="top: 900px; left: 0px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
</div>
<div style="top: 1200px; left: 0px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
</div>
<div style="top: 0px; left: 400px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
</div>
<div style="top: 300px; left: 400px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
</div>
<div style="top: 600px; left: 400px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
</div>
<div style="top: 900px; left: 400px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
</div>
<div style="top: 1200px; left: 400px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
</div>
<div style="top: 0px; left: 800px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
</div>
<div style="top: 300px; left: 800px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
</div>
<div style="top: 600px; left: 800px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
</div>
<div style="top: 900px; left: 800px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
</div>
<div style="top: 1200px; left: 800px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
</div>
<div style="top: 0px; left: 1200px; position: fixed; float: left;">
[[File:Cobson.png|link=]]
</div>
<div style="top: 300px; left: 1200px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
</div>
<div style="top: 600px; left: 1200px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
</div>
<div style="top: 900px; left: 1200px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
</div>
<div style="top: 1200px; left: 1200px; position: fixed; float: left;">
[[File:coinslot.png|link=]]
A bijection between two sets, \(X\) and \(Y\), is a "one-to-one pairing" of their elements. Formally, it is a function \(f: X \to Y\) (which can be encoded as a subset of \(X \times Y\)) so that:
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