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1   2   1

    2

1   1   1

1   2   1

    2
    ^
1 < 0 > 1

1   2   1

    1
^       ^
0 >   < 0

0 > 2 < 0
v       v
    1

    1 < 0 > 1 
        v     
3   1       1   3

  < 0 >   < 0 >
    v       v
3   1       1   3

3 < 0 >    < 0 > 3