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<TITLE>Permutations: Change ringing</TITLE>
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<h1>Change Ringing</h1>
<p>This concerns the ringing of bells. 
<br>It originated in England around 1600.
<br>Often, a church has 6 or 8 bells, and change ringing means 
<br>that the bells ring one after the other,
<br>presenting in this way all possible permutations.



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