3 m in length, 3 m in width, and 4 m in height. Each cabinet has
four layers, and therefore there is a total of 24 partitions. Each partition
is assigned with a unique number (i.e., A1, A2, A3, A4,
B1,. . .). There is a 1 m width passageway between two cabinets.
Whenever customer orders received, warehouse personnel are requested
to pick tea boxes from those 24 partitions and pack them
into mail boxes for delivery