1/2 a^{a1,a2}_{a0,v0} b^{c0}_{a3} c^{c1,c2}_{a4,v1} eta1^{a4}_{a2} eta1^{a3}_{a1} a+(a0) a+(v0) a+(v1) a-(c2) a-(c1) a-(c0)
+1/4 a^{a1,a2}_{a0,v0} b^{c0}_{a3} c^{c1,c2}_{a4,v1} lambda2^{a3,a4}_{a1,a2} a+(a0) a+(v0) a+(v1) a-(c2) a-(c1) a-(c0)
-1/4 a^{a2,a3}_{a1,v0} b^{c0}_{a0} c^{c1,c2}_{a4,v1} lambda2^{a1,a4}_{a2,a3} a+(a0) a+(v0) a+(v1) a-(c2) a-(c1) a-(c0)
+1/4 a^{a2,a3}_{a1,v0} b^{c0}_{a4} c^{c1,c2}_{a0,v1} lambda2^{a1,a4}_{a2,a3} a+(a0) a+(v0) a+(v1) a-(c2) a-(c1) a-(c0)