It is known that:
- Each of them had three of the following toppings: sausage, pepperoni, mushroom, olives, and green pepper.
- The only topping that Clara and Elena had in common was sausage.
- The only topping Anna and Brenda had in common was pepperoni.
- The only topping Daniella and Elena had in common was mushroom.
- The only topping Anna and Daniella had in common was green pepper.