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0   1   2   3   4   5   6   7   8   9
10  11  12  13  14  15  16  17  18  19
20  21  22  23  24  25  26  27  28  29
30  31  32  33  34  35  36  37  38  39
40  41  42  43  44  45  46  47  48  49
50  51  52  53  54  55  56  57  58  59
60  61  62  63  64  65  66  67  68  69
70  71  72  73  74  75  76  77  78  79
80  81  82  83  84  85  86  87  88  89
90  91  92  93  94  95  96  97  98  99

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90  91  92  93  94  95  96  97  98  99
80  81  82  83  84  85  86  87  88  89
70  71  72  73  74  75  76  77  78  79
60  61  62  63  64  65  66  67  68  69
50  51  52  53  54  55  56  57  58  59
40  41  42  43  44  45  46  47  48  49
30  31  32  33  34  35  36  37  38  39
20  21  22  23  24  25  26  27  28  29
10  11  12  13  14  15  16  17  18  19
0   1   2   3   4   5   6   7   8   9