Ты start off with the -1 pattern then go to the -10 3 times then Ты go back to -1 the other two times. Like Ты start off with 91-1=90 then -1 again to get 98 then Ты -10 to that to get 88.Then if Ты -10 again Ты get 78, and after that Ты minus ten one еще time to get 68.