∗ | e | r | r2 | r3 | s | rs | r2s | r3s |
---|---|---|---|---|---|---|---|---|
e | e | r | r2 | r3 | s | rs | r2s | r3s |
r | r | r2 | r3 | e | rs | r2s | r3s | s |
r2 | r2 | r3 | e | r | r2s | r3s | s | rs |
r3 | r3 | e | r | r2 | r3s | s | rs | r2s |
s | s | r3s | r2s | rs | e | r3 | r2 | r |
rs | rs | s | r3s | r2s | r | e | r3 | r2 |
r2s | r2s | rs | s | r3s | r2 | r | e | r3 |
r3s | r3s | r2s | rs | s | r3 | r2 | r | e |