given range(1, 15), find a 7x7 matrix that:
- each row is list of tuples like
[(1, 2), (3, 4), (5, 6), (7, 8), (9, 10), (11, 12), (13, 14))]
- always
n[0]<n[1]
for everyn
in all tuples - every element in the tuple must be unique in the row
- every tuple in the whole matrix must be unique.