(j1j2j3m1m2m3)⁢{j1j2j3l1l2l3}=∑m1′⁢m2′⁢m3′(-1)l1+l2+l3+m1′+m2′+m3′⁢(j1l2l3m1m2′-m3′)⁢(l1j2l3-m1′m2m3′)⁢(l1l2j3m1′-m2′m3).