Input: a = [0,1,2,3,4,5,6,7,8,9]
       b = [1,1,1,1,1,1,1,1,1,1]

Output: [[0, 1, 2, 3, 4],
         [5, 6, 7, 8, 9],
         [1, 1, 1, 1, 1],
         [1, 1, 1, 1, 1]]