texts: domain: pizza ordering  <s> yes </s> <s> how many toppings on your pizza </s> <s> four  </s> <s> what is the first topping </s> <s> mushroom </s> <s> what is the second topping </s> <s> green pepper </s> <s> what is the third topping </s> <s> onion
labels: what is the fourth topping