b-p bbb bbc bbo bbp bbr bby bcb bcc bco bcp bcr bcy bob boc boo bop bor boy bpb bpc bpo bpp bpr bpy brb bro brp brr bry by- byc byo byp byr c-- cbb cbc cbo cbp cbr cby ccb ccc cco ccp ccr co- cob coc coo cop cor coy cpb cpc cpo cpp cpr crb crc cro crp crr cry cyb cyc cyo cyp cyr ob- obb obc obo obp obr oby oc- ocb occ oco ocp ocr oo- oob ooc ooo oop oor op- opb opc opo opp opr opy or- orb orc oro orp orr ory oyo p-p pbb pbc pbo pbp pbr pby pcb pcc pco pcp pcr pob poc poo pop por poy ppb ppc ppo ppp ppr prb prc pro prp prr pry py- pyb pyc pyo pyr rbb rbc rbo rbp rbr rcb rcc rco rcp rcr rob roc roo rop ror roy rpb rpc rpo rpp rpr rrb rrc rrp rrr ry- ryc ryo ryr ryy ybc ybp ybr yby ycc yco ycp ycy yob yoc yoo yop yor yoy ypo yrc yro yrp yyb yyc yyy