a-a a-b aaa aab aah aao aap aar aas ab- aba abb abh abo abp abr abs aha ahb ahh aho ahp ahr ahs aoa aob aoh aoo aop aor aos ap- apa apb aph apo app apr aps ar- ara arb arh aro arp arr ars as- asa asb ash aso asp asr ass b-p baa bab bah bao bap bar bas bba bbb bbh bbo bbp bbr bbs bha bhb bhh bho bhp bhr bhs boa bob boh boo bop bor bos bpa bpb bph bpo bpp bpr bps bra brb brh bro brp brr brs bsa bsb bsh bso bsp bsr bss haa hab hah hao hap har has hba hbb hbh hbo hbp hbr hbs hha hhb hhh hho hhp hhr hhs hoa hob hoh hoo hop hor hos hpa hpb hph hpo hpp hpr hps hr- hra hrb hrh hro hrp hrr hrs hsa hsb hsh hsp hsr hss oaa oab oah oao oap oar oas ob- oba obb obh obo obp obr obs oha ohh oho ohp ohr ohs oo- ooa oob ooh ooo oop oor oos op- opa opb oph opo opp opr ops or- ora orb orh oro orp orr ors os- osa osb osh oso osp osr oss p-p paa pab pah pao pap par pas pba pbb pbo pbp pbr pbs pha phb pho php phr phs poa pob poh poo pop por pos ppa ppb pph ppo ppp ppr pps pra prb prh pro prp prr prs ps- psa psb psh pso psp psr pss ra- raa rab rah rao rap rar ras rba rbb rbh rbo rbp rbr rbs rh- rha rhb rhh rho rhp rhr rhs roa rob roh roo rop ror ros rpa rpb rph rpo rpp rpr rps rra rrb rrh rrp rrr rrs rsa rsb rsh rso rsp rsr rss saa sab sah sao sap sar sas sba sbb sbh sbo sbp sbr sbs sh- sha shb shh sho shp shr shs soa sob soh soo sop sor sos spa spb sph spo spp spr sps sr- sra srb srh sro srp srr srs ss- ssa ssb ssh sso ssp ssr sss