The sets -LCB- a , a -RCB- and -LCB- a -RCB- are equal , unlike the multisets -LCB- a , a -RCB- and -LCB- a -RCB- .

The sets -LCB- a , b -RCB- and -LCB- b , a -RCB- are equal , and the sets -LCB- a , a -RCB- and -LCB- a -RCB- are equal too .
