advance back up start[>]

519[D!][U][G]
520[D!][U][G]
521[D!][U][G]
522[D!][U][G]
523[D!][U][G]
524[D!][U][G]
525[D!][U][G]
526[D!][U][G]
527[D!][U][G]
528[D!][U][G]
529[D!][U][G]
530[D!][U][G]
531[D!][U][G]