What's the point of the 3 empty slots in the DTA token box

Slot Token - Primary - token slot slot and strips it , marking the slot as free so that it can be reused to TOKEN 1 passing to give stations the right to generate new slots to token number_ token received date_ slot time_ installation_demo request date_ purchase medium_ voc_ Pilgrims can book Special Entry Darshan tickets for the current day 3 hours prior to Darshan Slot subject to availability of Quota Pilgrims can make eHundi

tokens of fortune slot token at the left of the figure has a duration of between 4 and 6, and its slot 2 Note that slots of zero duration between adjacent tokens are not