duplicate certain lines _A_ by 51b

import std.stdio;void main(){int[400]a;int n,m;for(;m^=10;a[n]=1)scanf("%d%c",&n,&m);for(string s;s=readln,s;)write(a[++m]?s~s:s);}

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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