[
 [  0   1   2   3   4   5   6   7   8   9]
 [ 20  21  22  23  24  25  26  27  28  29]
 [ 40  41  42  43  44  45  46  47  48  49]
 [ 60  61  62  63  64  65  66  67  68  69]
 [ 80  81  82  83  84  85  86  87  88  89]
 [100 101 102 103 104 105 106 107 108 109]
]