What directive does the Host give the travelers at the end of the Prologue from The Canterbury Tales?

At the end of the Prologue from The Canterbury Tales, the Host proposes each of the travelers to tell two stories on their way to Canterbury and two more on their way back, so that the journey is more enjoyable.

The host will ride with them and will be their judge and guide. The man who tells the best story will be given a supper in the host's tavern, paid by the rest of them. The man who draws the shortest cut shall begin telling the first story.