row 1, col 1
row 1, col 2
row 1, col 3
row 2, column 1
row 2, columns 2 and 3
row 2, column 4
row 3, column 1
row 3, column 2
row 3, column 3
row 3, column 4
rows 4 and 5, column 1
row 4, column 2
row 4, column 3
row 4, column 4
row 5, column 2
row 5, column 3
row 5, column 4