From the Hubble, the survey "served or not served":
WWW: Where is the option “I serve”?
xxx: If this is the first day of service, then technically it turns out that you have not served yet. If not the first, then at least one day of service has passed, which means that it has already served.
Yyy: No, if he served at least a portion of the time, he served already. If the quantum time hypothesis is correct, then it requires a minimum of 10^-43 seconds (Planc time).
zzz: You listened to a programmer’s conversation with a physicist.