bbb bbc bbs bbt bby bcb bcc bcs bct bcy bsb bsc bss bst bsy btb btc bts btt bty by- byc bys byt c-- cbb cbc cbs cbt cby ccb ccc ccs cct csb csc css cst csy ctb ctc cts ctt cty cyb cyc cys cyt sbb sbc sbs sbt sby scb scc scs sct ss- ssb ssc sss sst stb stc sts stt sty sy- syb syc sys syt tbb tbc tbs tbt tcb tcc tcs tct tsb tsc tss tst tsy ttb ttc tts ttt tty tyc tys tyt ybc ybs yby ycc ycs ycy ysb ysc yss yst ysy ytc yts ytt yyb yyc yys yyt yyy

bbbb bbbs bcbc bcbs bccc bccs bcsc bcss bctc bcts bscs bssc bsts btcc btcs btss bttb bysb byss byst bysy byts cbbc cbbs cbcc cbcs cbct cbsc cbtc cbyt ccbc cccb cccc cccs ccss ccst cctb cctc cctt cscb cscc cscs cstc csts csys ctbs ctsc ctss ctts cybb cybc cyc- cycb cycc cycs cyst cyt- cytb cyy- cyyc sbbs sbcc sbcs sbct sbst sbtc sccc sccs scct sccy scsc scst sctc scts ssby sscc sscs sssb sssc ssss sstb sstc ssts stbc stbs stcc stcs stss sttc stys syss syst sytt tbbs tbcb tbcc tbst tcbs tcby tccc tctc tcts tsbc tscc tsst tstc tsts tsys ttbb ttss tttt ttys tyss tyst tytt tyty ybbs yccc ycsb yctc ysby ysyb yyyy

bcbst by-by bytyc cc-by ccccc cstcc cyst- cysts cytyc sccbc scyt- sssss systs tbtbt ttttt

bbbbbb bs-tbs sttstc

bbbbbbb sssssss

bbbbbbbb

bbbbbbbbbbbbbbb ccccccccccccccc