wherein {HEAD ~ the second core} and the third core commonly include {TAIL ~ a core portion} extending from the reference perpendicular line toward the splitting side so that the second core and the third core are formed integrally 
commonly include
wherein { HEAD ~ the second core } and the third core commonly include { TAIL ~ a core portion } extending from the reference perpendicular line toward the splitting side so that the second core and the third core are formed integrally
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH