1/2 a^{a1}_{a0,v0} b^{a4,v1}_{a2,a3} lambda2^{a2,a3}_{a1,a4} a+(a0) a+(v0) a-(v1)
+a^{a3}_{a0,v0} b^{a2,v1}_{a1,a4} eta1^{a4}_{a3} a+(a0) a+(a1) a+(v0) a-(v1) a-(a2)
-a^{a2}_{a1,v0} b^{a4,v1}_{a0,a3} eta1^{a3}_{a2} gamma1^{a1}_{a4} a+(a0) a+(v0) a-(v1)
-a^{a2}_{a1,v0} b^{a4,v1}_{a0,a3} lambda2^{a1,a3}_{a2,a4} a+(a0) a+(v0) a-(v1)
+1/2 a^{a0}_{a3,v0} b^{a4,v1}_{a1,a2} gamma1^{a3}_{a4} a+(a1) a+(a2) a+(v0) a-(v1) a-(a0)