l=length{a[++i]=$0}i>6{for($80=$0=_;j++<l+80;s=s RS)for(k=0;k++<7;s=s RS)for(m=0;m<80;m++)s=s((c=substr($0a[k]$0,j+m,1))==FS||k-4||m-50?c:"*")}$0=s
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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