 A user's request at a time slot is satisfied if the requested file is already hosted on at least one of the caches connected to the user at that time slot.
<clarity>  A user's request at a time slot is satisfied if the requested file is already hosted on at least one of the caches connected to the user at that time slot.
 A user's request is met if the requested file is already hosted on at least one of the caches connected to the user at that time slot.