i dont understand how to solve this problem, please help and show explanation

Onestion 4: Suppose that stock FFM is traded in the NYSE and all trading in that stock is through a limit order book. Further, assume that at July 1,2008 at 10:48 am the limit order book of FFM was empty. Following are the trade orders for FFM after 10:48 am: Create the limit order book for this stock immediately after all the above trades are submitted. That is, create the limit order book immediately after 11:19am. Onestion 4: Suppose that stock FFM is traded in the NYSE and all trading in that stock is through a limit order book. Further, assume that at July 1,2008 at 10:48 am the limit order book of FFM was empty. Following are the trade orders for FFM after 10:48 am: Create the limit order book for this stock immediately after all the above trades are submitted. That is, create the limit order book immediately after 11:19am