1/4 a^{a1,a2}_{v0,v1} b^{c0,c1}_{a0,a3} c^{v2}_{a4} eta1^{a4}_{a2} eta1^{a3}_{a1} a+(a0) a+(v0) a+(v1) a-(v2) a-(c1) a-(c0)
+1/8 a^{a1,a2}_{v0,v1} b^{c0,c1}_{a0,a3} c^{v2}_{a4} lambda2^{a3,a4}_{a1,a2} a+(a0) a+(v0) a+(v1) a-(v2) a-(c1) a-(c0)
+1/8 a^{a1,a2}_{v0,v1} b^{c0,c1}_{a3,a4} c^{v2}_{a0} eta1^{a4}_{a2} eta1^{a3}_{a1} a+(a0) a+(v0) a+(v1) a-(v2) a-(c1) a-(c0)
+1/16 a^{a1,a2}_{v0,v1} b^{c0,c1}_{a3,a4} c^{v2}_{a0} lambda2^{a3,a4}_{a1,a2} a+(a0) a+(v0) a+(v1) a-(v2) a-(c1) a-(c0)