If F's commercial is shown earlier than I's, then the only positions in which G's commercial could be shown are

#3 has to be a long commercial and I > HK, then how could G be #1? because then It would go G, I, H, K and, but if G were #1 then H would have to be #3 and long and #4 would have to be K which we know is long but you can't have two longs consecutively.