Answer 1

print out z spreadsheets, name the lines y and the rows x. now stack them.

if you refer to this as an array it would be [z][y][x] or respectively [page][line][row]

array[3][0][1] = 2
-> write a 2 into the 2nd row of the 1st line on the 4th page

x = [2][0][2]
-> assign the value that's on the 3rd page in the 1st line and 3rd row to x