[1]:a, b
[2]:c, [1]
[3]:d, e
[4]:f, [3]
[5]:g, h
[6]:i, [5]
[7]:[2], [4]
[8]:j, [6]
[9]:[7], [8]
---------------------
[2]:c, a, b
[3]:d, e
[4]:f, [3]
[5]:g, h
[6]:i, [5]
[7]:[2], [4]
[8]:j, [6]
[9]:[7], [8]
---------------------
[2]:c, a, b
[4]:f, d, e
[5]:g, h
[6]:i, [5]
[7]:[2], [4]
[8]:j, [6]
[9]:[7], [8]
---------------------
[2]:c, a, b
[4]:f, d, e
[6]:i, g, h
[7]:[2], [4]
[8]:j, [6]
[9]:[7], [8]
---------------------
[6]:i, g, h
[7]:c, a, b, f, d, e
[8]:j, [6]
[9]:[7], [8]
---------------------
[7]:c, a, b, f, d, e
[8]:j, i, g, h
[9]:[7], [8]
---------------------
[9]:c, a, b, f, d, e, j, i, g, h
---------------------
[9]:c, a, b, f, d, e, j, i, g, h