julia> [i + j for i in 1:5, j in 1:5]
5×5 Array{Int64,2}:
 2  3  4  5   6
 3  4  5  6   7
 4  5  6  7   8
 5  6  7  8   9
 6  7  8  9  10

julia> [i + j for i in 1:5, j in 1:5, k in 1:2]
5×5×2 Array{Int64,3}:
[:, :, 1] =
 2  3  4  5   6
 3  4  5  6   7
 4  5  6  7   8
 5  6  7  8   9
 6  7  8  9  10

[:, :, 2] =
 2  3  4  5   6
 3  4  5  6   7
 4  5  6  7   8
 5  6  7  8   9
 6  7  8  9  10
