1/2 a^{c1}_{c0,a0,a1} b^{c3,c4,a2}_{c2} gamma1^{a1}_{a2} a+(c0) a+(c2) a+(a0) a-(c4) a-(c3) a-(c1)
+1/2 a^{c0}_{c3,a0,a1} b^{c2,c3,a2}_{c1} a+(c1) a+(a0) a+(a1) a-(a2) a-(c2) a-(c0)
+a^{c0}_{c3,a0,a1} b^{c2,c3,a2}_{c1} gamma1^{a1}_{a2} a+(c1) a+(a0) a-(c2) a-(c0)