b-p bbb bbc bbk bbo bbp bby bcb bcc bck bco bcp bcy bkb bkc bkk bko bkp bob boc bok boo bop boy bpb bpc bpo bpp bpy by- byc byk byo byp c-- cbb cbc cbk cbo cbp cby ccb ccc cck cco ccp ckb ckc cko cky co- cob coc cok coo cop coy cpb cpc cpk cpo cpp cyb cyc cyk cyo cyp kbb kbc kbk kbo kbp kcb kcc kck kcp kkb kkc kkk kkp kky kob koc kok koo kop koy kpc kpk kpo kpp kyc kyo kyp ob- obb obc obk obo obp oby oc- ocb occ ock oco ocp okb okc okk oko okp oo- oob ooc ook ooo oop op- opb opc opk opo opp opy oyo p-p pbb pbc pbk pbo pbp pby pcb pcc pck pco pcp pkb pkc pko pkp pky pob poc pok poo pop poy ppb ppc ppk ppo ppp py- pyb pyc pyk pyo ybc ybp yby ycc yco ycp ycy ykk yob yoc yok yoo yop yoy ypo yyb yyc yyy