N + ( x )

N ( x )

I + ( x )

I ( x )

| N + ( x ) | | N ( x ) |

λ ( x )

x4

{x8}

{x6}

{x5, x7}

{ }

0

2

x5

{x2, x6, x7}

{ }

{x4}

{ }

3

3

x6

{x4}

{x5}

{ }

{x7}

0

−0.75

x7

{x2, x8}

{x5}

{x4}

{x6}

1

0.75