bbb bbc bbd bbk bbo bbr bby bcb bcc bcd bck bco bcr bcy bcz bdb bdc bdd bdk bdo bdr bdy bdz bkb bkc bkk bko bkr bob boc bod bok boo bor boy boz brb brd brk bro brr bry brz by- byc byd byk byo byr byz bzd bzo bzr bzz c-- cbb cbc cbd cbk cbo cbr cby cbz ccb ccc ccd cck cco ccr ccz cdb cdc cdd cdk cdo cdr cdy cdz ckb ckc ckd cko cky co- cob coc cod cok coo cor coy coz crb crc crd crk cro crr cry crz cyb cyc cyd cyk cyo cyr cz- czc czd czk czo dbb dbc dbd dbk dbo dbr dby dbz dcb dcc dcd dck dco dcr ddb ddc ddd ddk ddo ddr ddy ddz dkb dkc dkk dko dkr dob doc dod dok doo dor doy doz drb drc drd drk dro drr dry drz dy- dyb dyc dyd dyk dyo dyr dyy dzb dzd dzo dzr k-z kbb kbc kbd kbk kbo kbr kbz kcb kcc kcd kck kcr kdb kdc kdk kdo kdr kdy kkb kkc kkk kkr kky kob koc kod kok koo kor koy koz krc krd krk kro krr kry kyc kyd kyo kyr kyz kzo kzy ob- obb obc obd obk obo obr oby oc- ocb occ ocd ock oco ocr ocz odb odc odd odo odr okb okc okd okk oko okr oo- oob ooc ood ook ooo oor or- orb orc ord ork oro orr ory orz oyd oyo ozo ozz rbb rbc rbd rbk rbo rbr rcb rcc rcd rco rcr rdb rdc rdd rdo rdr rdy rkb rkc rkk rko rky rkz rob roc rod rok roo ror roy roz rrb rrc rrd rrk rrr ry- ryc ryd ryk ryo ryr ryy ryz rzb rzo rzy ybc ybr yby ybz ycc ycd yco ycy ydo ydy ykk yob yoc yod yok yoo yor yoy yrc yro yyb yyc yyy yyz yzb yzr yzy zbb zbc zbr zby zco zo- zob zoc zod zok zoo zor zro zzr zzy zzz