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quine: add article from old wiki (thanks Amavect)

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+++ b/quine.md

@@ -1,0 +1,9 @@

+# Plan 9's Quines

+

+Quine in rc.

+

+	a=`{echo ' a=`{echo '' Q '' }; q= W ; for(i in $a){if(~ $i Q){for(i in $a){if(~ $i $q) echo -n $q; echo -n $i E }};if not{if(~ $i W) echo -n $q$q$q$q E ; if not{if(~ $i E) echo -n $q$q E ; if not echo -n $i E }}};echo ' }; q= '''' ; for(i in $a){if(~ $i Q){for(i in $a){if(~ $i $q) echo -n $q; echo -n $i '' }};if not{if(~ $i W) echo -n $q$q$q$q '' ; if not{if(~ $i E) echo -n $q$q '' ; if not echo -n $i '' }}};echo 

+

+Share your solutions!

+

+[Quine on Wikipedia](https://en.wikipedia.org/wiki/Quine_(computing))