R(S
i
)
Q(S
i
)
R(S
i
)∩Q(Si)
S
1
1,3,4,5,7,8,9
1
1
S
2
2,3,4,5,7,8,9
2
2
S
3
3,4,5,7,8,9
1,2,3,4,5,6,7,8,9
3,4,5,7,8,9