bbbb bbci bcbc bcbg bccc bcci bcit bctc bibb bibi bicc bicg bici bigb bigc bigg bigt bitc bitt btcc bttb bygg byit cbbc cbcc cbct cbgb cbit cbtc cbyt ccbc cccb cccc ccci ccgc ccgt ccic ccii cctb cctc cctt cgcc cgcg cibc cibi cicc cici cict cigi ciii ciit citb citg citi citt city ctbi ctic cybb cybc cybi cyc- cycb cycc cygb cyt- cytb cyy- cyyc gc-c gcbc gccc gcic gcii gctc ggbt gggg gibb giby gigg gigi gytt i-by ibtb ibtc ibyi icbc iccb iccc icci icct icgc igbc igcc iggy iiii iiit iitt itby itgc itic itty tbcb tbcc tbit tcby tccc tctc tgcc tgtc tibi ticc tigi tigy tiit titc titi titt tiyi ttbb tttt tybi tyti tytt tyty yccc yctc yiti yyyy