The snack machine can only vend where there are snacks (across locations 1, 3, 6, and 7). Snack slots 2, 4 and 5 are currently empty and the venting machine will not work if these locations are selected. The snack machine will vend if L = 0, 1, 3, 6, or 7, T = 0, 1, 3, 6, or 7, and L# T. Any other combination of L and T values will result in a vending error and no snack will be vended. Example 1: If Left (L) is 1 and the Top is (7), the snack at (1,7) is successfully vended.