df-1-2

3-3-1+2

1-2-1

2-4-3

2-4-4

1-2-3-3

db-1-1

db-1-3

1-3-2

df-4-2-df+1

df-2-1

d-4-3

df-4-2-3

df-4-2-4

df-4-2-df+2

