In Papua New Guinea, we have Cultural Shows with celebrating our unity in our diversity. At these cultural shows, individuals and organizations set up stalls in the show grounds. For the organisers, there is a problem that is always faced. And that is how to give stall passes and keep track of them. Last year at the Papua New Guinea University of Technology Cultural Show and 39th Independence Anniversary Celebrations, the organizing committee faced the same problem. How could we make sure that one stall pass was not used for multiple entries? Stall passes are needed to maintain the stalls so they need to: Have unlimited entries; and Be valid for the duration of the show Problem Certain people use the stall pass for multiple entries. After the stall keepers have used the pass for entry, it is passed to others to enter the show arena without paying. Solution To prevent this from happening, two sets of stall passes were used. Stall entry pass Stall exit pass ...