Classifying edges

a

b

c

x

1

x

x

3

y

1

y

2

y

3

y

4

2

a

b

c

y

1

y

3

y

4

x

1

x

2

x

3

y

2

Uncontradicted

Uncontradicted but adjacent to contradicted

Contradicted

{

T

1

,

T

2

}

S

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