Susan is a hotel receptionist and checking in a block of rooms for a sports team. All seems to go well, and she checks in the full group. Later in her shift, 2 more players arrive needing a room in the block, but all the rooms have been noted as taken. The coordinator for the group confirms the number of rooms has not changed, and thus there must be one room accidentally checked in. Unfortunately, Susan did not note down which rooms she gave keys out to, and the computer did not list which keys were currently active for each room. How did this mistake happen