|For example, suppose that the knowledge base pizza.txt contains the sizes, shapes, and prices for various pizzas. You would like to know the size of any round pizzas.|3660|3705|1620|2895||0|0|0|0|
|The knowledge base does not contain a fact such as sizeofroundpizza(14) that would specifically apply to your query. However, Prolog can find the size of the round pizza using a conjunction of two goals.|1805|4185|1830|2895||0|0|2|0|
|The second goal directs Prolog to look for the size of the same pizza that was located by the first goal. Let's see how it works.|4755|4930|1155|2940||0|0|3|0|