Sentence 1: Billy like cupcakes. 
 Sentence 3: He wanted to learn how so he searched online for a recipe 
 Sentence 4:  Billy found a recipe and a step by step guide on how to make cupcakes 
 Sentence 5:  He followed the recipe and guide, the cupcakes turned out delicious 
 Given Sentence 2: Nobody knew how to make cupcakes in Billy's household.