M = 5

M = 4

M = 3

M = 2

Users

St1

St2

St3

St1

St2

St3

St1

St2

St3

St1

St2

St3

1

1

2345

345

1

234

23

1

23

123

1

2

12

2

2

1345

145

2

134

34

2

13

123

2

1

12

3

3

1245

125

3

124

14

3

12

123

4

4

1235

123

4

123

12

5

5

1234

134