Example (12)

U = {A,B,C,D,E,F,G,H,I,J}

S1 = {A,C,E,G,I}

S2 = {C,D,F,G,I,J}

S3 = {A,B,E,G}

E

B

G

I

A

C

D

J

H

F

1

2

3

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