-1/2 a^{v0,v1}_{c0,a0} b^{a1,a2}_{c1,v2} c^{v3}_{a3} eta1^{a3}_{a2} gamma1^{a0}_{a1} a+(c0) a+(c1) a+(v2) a-(v3) a-(v1) a-(v0)
+1/4 a^{v0,v1}_{c0,a0} b^{a1,a2}_{c1,v2} c^{v3}_{a3} lambda2^{a0,a3}_{a1,a2} a+(c0) a+(c1) a+(v2) a-(v3) a-(v1) a-(v0)
-a^{v0,v2}_{c0,a0} b^{a1,a2}_{c1,v2} c^{v1}_{a3} eta1^{a3}_{a2} a+(c0) a+(c1) a+(a0) a-(v1) a-(v0) a-(a1)
-a^{v0,v2}_{c0,a0} b^{a1,a2}_{c1,v2} c^{v1}_{a3} eta1^{a3}_{a2} gamma1^{a0}_{a1} a+(c0) a+(c1) a-(v1) a-(v0)
+1/2 a^{v0,v2}_{c0,a0} b^{a1,a2}_{c1,v2} c^{v1}_{a3} lambda2^{a0,a3}_{a1,a2} a+(c0) a+(c1) a-(v1) a-(v0)
-a^{v0,v2}_{c0,a2} b^{a0,a3}_{c1,v2} c^{v1}_{a1} gamma1^{a2}_{a3} a+(c0) a+(c1) a+(a1) a-(v1) a-(v0) a-(a0)