bbb bbc bbd bbk bbo bbr bby bcb bcc bcd bck bco bcr bcy bdb bdc bdd bdk bdo bdr bdy bkb bkc bkk bko bkr bob boc bod bok boo bor boy brb brd brk bro brr bry by- byc byd byk byo byr c-- cbb cbc cbd cbk cbo cbr cby ccb ccc ccd cck cco ccr cdb cdc cdd cdk cdo cdr cdy ckb ckc ckd cko cky co- cob coc cod cok coo cor coy crb crc crd crk cro crr cry cyb cyc cyd cyk cyo cyr dbb dbc dbd dbk dbo dbr dby dcb dcc dcd dck dco dcr ddb ddc ddd ddk ddo ddr ddy dkb dkc dkk dko dkr dob doc dod dok doo dor doy drb drc drd drk dro drr dry dy- dyb dyc dyd dyk dyo dyr dyy kbb kbc kbd kbk kbo kbr kcb kcc kcd kck kcr kdb kdc kdk kdo kdr kdy kkb kkc kkk kkr kky kob koc kod kok koo kor koy krc krd krk kro krr kry kyc kyd kyo kyr ob- obb obc obd obk obo obr oby oc- ocb occ ocd ock oco ocr 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 oyd oyo rbb rbc rbd rbk rbo rbr rcb rcc rcd rco rcr rdb rdc rdd rdo rdr rdy rkb rkc rkk rko rky rob roc rod rok roo ror roy rrb rrc rrd rrk rrr ry- ryc ryd ryk ryo ryr ryy ybc ybr yby ycc ycd yco ycy ydo ydy ykk yob yoc yod yok yoo yor yoy yrc yro yyb yyc yyy