L, M, N, O and P are five buses of different sizes. Two of them provide food on board, 3 are luxurious buses and 3 are air conditioned buses. One has capacity of less than 20 passengers, 2 have capacity between 20 to 40 passengers, 2 have capacity of more than 40 passengers.  The buses having capacity of more than 40 passengers are air-conditioned but not luxurious. Bus N has capacity of less than 20 passengers and is luxurious. Buses L and O provide food.  The buses which provide food are luxurious and ply between Delhi and Agra. The buses which ply between Delhi and Agra are: