s="%#{k="\x11 ."[z=id%3]}s"%$/*x='\xc4"'[z]||$$ gets.to_i.times{x+=[k,-1,-k,1][3&$.-=1|s[x]^=3]} $><<s
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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