function f(s,x,y)q=x>0 or print(s),y<x and f(s..0,x-1,y),y<1 or f(s..1,x-1,y-1)end a=io.read f("",a"*n",a"*n")
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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