-1/2 a^{a1,a2}_{a0,v0} b^{c0}_{a3} c^{c2,c3}_{c1,a4} eta1^{a4}_{a2} eta1^{a3}_{a1} a+(c1) a+(a0) a+(v0) a-(c3) a-(c2) a-(c0)
-1/4 a^{a1,a2}_{a0,v0} b^{c0}_{a3} c^{c2,c3}_{c1,a4} lambda2^{a3,a4}_{a1,a2} a+(c1) a+(a0) a+(v0) a-(c3) a-(c2) a-(c0)
+1/4 a^{a2,a3}_{a1,v0} b^{c0}_{a0} c^{c2,c3}_{c1,a4} lambda2^{a1,a4}_{a2,a3} a+(c1) a+(a0) a+(v0) a-(c3) a-(c2) a-(c0)
-1/4 a^{a2,a3}_{a1,v0} b^{c0}_{a4} c^{c2,c3}_{c1,a0} lambda2^{a1,a4}_{a2,a3} a+(c1) a+(a0) a+(v0) a-(c3) a-(c2) a-(c0)