julia> l = 1:81
1:81

julia> l = reshape(l, (9, 9))
9x9 Array{Int32,2}:
 1  10  19  28  37  46  55  64  73
 2  11  20  29  38  47  56  65  74
 3  12  21  30  39  48  57  66  75
 4  13  22  31  40  49  58  67  76
 5  14  23  32  41  50  59  68  77
 6  15  24  33  42  51  60  69  78
 7  16  25  34  43  52  61  70  79
 8  17  26  35  44  53  62  71  80
 9  18  27  36  45  54  63  72  81

julia> l[1:2; 4:5]
2x2 Array{Int32,2}:
 28  37
 29  38