advance back up start[>] 4169[D!][U][G] 4170[D!][U][G] 4171[D!][U][G] 4172[D!][U][G] 4173[D!][U][G] 4174[D!][U][G] 4175[D!][U][G] 4176[D!][U][G] 4177[D!][U][G] 4178[D!][U][G]