x: 1, y: 4
x: 2, y: 5
-----
x: 1, y: 4
x: 2, y: 5
-----
x: 1, y: 4
x: 2, y: 5
-----
x: 1, y: h
x: 2, y: e
x: 3, y: l
1
2
3
-----
1
2
3
-----
1
2
3
-----
3
4
5
-----
(1, 4)
(2, 5)
(3, 6)