q=1-p, x=2pq 2+p^2 (1-p^2) 4+q^2(1-q^2)4+(p^4+q^4)(2pq)6+p^6(1-p^2)8+q^6(1-q^2)8+p^4 q^2 8+q^4 p^2 8+ (p^8+q^8)(8+x), p=0.2