ggg ttt bbb ggg ttt bbb ggg ttt bbb ggg ttt bbb
gt gt gt tg tg tg gb gb gb bg bg bg tb tb tb bt bt bt
gtb btg gtb btg tgb tbg gbt gbt gtb btg tgb tbg
gtbgtb btgbtg tgbtgb gtbgtb btgbtg tgbtgb
gttb bggb tbbg gbbt tggb bttg ggtb bbtg ttgb ggbt