In this task, based on the given input, we ask you to write a question about when an event happened. Your question should be answerable with common knowledge on when events usually take place. For example, "going to school" usually happens during the day (not at 2 A.M). Don't create questions which have explicit mentions of answers in the text. Instead, it has to be implied from what is given. In other words, we want you to use "instinct" or "common sense". The written questions are not required to have a single correct answer.

Example Input: Sentence: The major organs of the digestive system include the mouth, esophagus, stomach, and small and large in- testines.
Example Output: When was the digestive system first mapped?

Example Input: Sentence: I clapped her shoulder to show I was not laughing at her.
Example Output: When did they clap her shoulder?

Example Input: Sentence: Alexander then faced the Assakenoi, who fought in the strongholds of Massaga, Ora and Aornos.
Example Output:
When did Alexander face the Assakenoi?

