How to remove similar list from a list. how to remove duplicates from the list

Question

index=[[25, 0], [25, 1], [25, 0], [25, 4], [25, 1], [25, 4], [56, 2], [56, 3]]
for x in range(0,len(index)):
    for y in range(x+1,len(index)):
        if index[x][