Multi-line trigger problem

Im having trouble creating a trigger that will count the number of times multiple items appear on a list, and compare the variables to see which item shows up more and act on that information

[#] [Time] [Destination]
[1] ---- (This package slot is empty)
[2] ---- (This package slot is empty)
[3] ---- (This package slot is empty)
[4] ---- (This package slot is empty)
[5] ---- (This package slot is empty)
[6] ---- (This package slot is empty)

each slot can be 1 of 6 locations... any ideas?