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