A=matrix([[0,-1,-2],[1,0,-1],[2,1,0]])
print(A)
B=matrix([[1,1/2.0,1/3.0],[2/1.0,2/2.0,2/3.0],[3/1.0,3/2.0,3/3.0]])
print(B)
C=dot(A,B)
print(C)
D=dot(B,A)
print(D)
E=dot(A,A)
print(E)