$0=$(i=FS=_){x=index(a="abcdefgh"99,$1);for(y=$2;i<8;f~/0|9/||$++FS=f)f=substr(99a,x+266/3^i%5,1)int(y+8534/3^i++%5-2)}1

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

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