Output

Add name, Q when done: Dick
{ Dick }
Add name, Q when done: Tom
{ Tom Dick }
Add name, Q when done: Harry
{ Harry Tom Dick }
Add name, Q when done: Tom
{ Harry Tom Dick }
Add name, Q when done: Q
Remove name, Q when done: Tom
{ Harry Dick }
Remove name, Q when done: Jerry
{ Harry Dick }
Remove name, Q when done: Q