Answer and Explanation:
In the story, there are three main characters: the Greek king, the vizir, and King Sindbad. The Greek king is narrating a story to the vizir, which is about a vizir who told a story to King Sindbad.
To summarize the story structure:
1. The Greek king: He is the narrator of the main story and is telling it to the vizir.
2. The vizir (the Greek king's audience): He is listening to the story being told by the Greek king.
3. King Sindbad: He is a character in the story that the vizir tells to the Greek king.
In this narrative, there are two layers of storytelling. The first layer is the Greek king telling a story to the vizir. The second layer is the vizir telling a story to King Sindbad.
The purpose of this storytelling structure is to create a nested narrative, adding depth and complexity to the overall story. It also allows for the introduction of multiple perspectives and voices within the narrative. The Greek king's story serves as a framing device for the vizir's story, creating a layered and engaging storytelling technique.