In the following code
A=[[99999,99999,1,99999],[1,99999,1,99999]]
A[0].index(A[0][2])
A[0].index(A[0][0])
A[0].index(A[0][1])
The index returned is the true one if the value is encountered form the first time in the 0th element of A. So A[0].index(A[0][2]) and A[0].index(A[0][0]) give the good index. But not A[0].index(A[0][1]). Why ?
