# matrix
# way to describe multidemensional list

matrix = [
    [1,2,3],
    [2,4,6],
    [7,8,9]
    ]

x_matrix = [
    [1,0,1],
    [0,1,0],
    [1,0,1]
    ] 

print(x_matrix[0][1])
    # [0] = first list -> 1,0,1
    # [1] = second item in first list -> 0