j1j2j3l1l2l3=∑mr⁢ms′-1l1+m1′+l2+m2′+l3+m3′⁢j1j2j3m1m2m3⁢j1l2l3m1m2′-m3′⁢l1j2l3-m1′m2m3′⁢l1l2j3m1′-m2′m3,