wherein a nearest distance between the first dummy metal and the second dummy metal is more than {HEAD ~ a nearest distance} between {TAIL ~ the third dummy metal} and the fourth dummy metal, and 
wherein a nearest distance between the first dummy metal and the second dummy metal is more than { HEAD ~ a nearest distance } between { TAIL ~ the third dummy metal } and the fourth dummy metal , and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH