a-a a-b a-i aaa aab aai aak aam aao aap aar aas ab- aba abb abi abk abm abo abp abr abs ai- aia aib aii aik aim aio aip air ais aka akb aki akk akm ako akp akr aks ama amb ami amk amm amo amp amr ams aoa aob aoi aok aom aoo aop aor aos ap- apa apb api apk apm apo app apr aps ar- ara arb ari ark arm aro arp arr ars as- asa asb asi ask asm aso asp asr ass b-p baa bab bai bak bam bao bap bar bas bba bbb bbi bbk bbm bbo bbp bbr bbs bi- bia bib bii bik bim bio bip bir bis bka bkb bkk bkm bko bkp bkr bks bma bmb bmi bmk bmm bmo bmp bmr bms boa bob boi bok bom boo bop bor bos bpa bpb bpi bpm bpo bpp bpr bps bra brb bri brk brm bro brp brr brs bsa bsb bsi bsk bsm bso bsp bsr bss ia- iaa iab iai iam iao iap iar ias iba ibb ibi ibk ibm ibo ibp ibr ibs iia iib iii iim iio iip iir iis ika ikb iki ikk iko ikr iks im- ima imb imi imm imo imp ims io- ioa iob ioi iom ioo iop ior ios ipa ipb ipi ipm ipo ipp ipr ips ir- ira irb iri irk irm iro irp irr irs is- isa isb isi isk ism iso isp isr iss ka- kaa kab kai kak kam kao kap kar kas kba kbb kbi kbk kbm kbo kbp kbr kbs kia kib kii kik kim kio kip kir kis kkb kki kkk kkm kkp kkr kks kma kmb kmi kmk kmm kmo kmp kms koa kob koi kok kom koo kop kor kos kpa kpi kpk kpm kpo kpp kpr kps kra kri krk kro krp krr krs ksa ksb ksi ksk ksm kso ksp ksr kss m-o m-r maa mab mai mak mam mao map mar mas mba mbb mbi mbk mbm mbo mbp mbr mbs mi- mia mib mii mik mim mio mip mir mis mka mkb mkk mkm mko mkp mkr mks mma mmb mmi mmk mmm mmo mmp mmr mms moa mob moi mok mom moo mop mor mos mpa mpb mpi mpk mpm mpo mpp mpr mps mra mrb mri mrk mrm mro mrp mrr mrs msa msb msi msk msm mso msp msr mss o-i oaa oab oai oak oam oao oap oar oas ob- oba obb obi obk obm obo obp obr obs oia oib oii oik oim oio oip oir ois oka okb oki okk oko okp okr oks om- oma omb omi omm omo omp omr oms oo- ooa oob ooi ook oom ooo oop oor oos op- opa opb opi opk opm opo opp opr ops or- ora orb ori ork orm oro orp orr ors os- osa osb osi osk osm oso osp osr oss p-p paa pab pai pak pam pao pap par pas pba pbb pbi pbk pbm pbo pbp pbr pbs pia pib pii pik pim pio pip pir pis pka pkb pki pkm pko pkp pkr pks pma pmb pmi pmk pmm pmo pmp pmr pms poa pob poi pok pom poo pop por pos ppa ppb ppi ppk ppm ppo ppp ppr pps pra prb pri prk prm pro prp prr prs ps- psa psb psi psk psm pso psp psr pss ra- raa rab rai rak ram rao rap rar ras rba rbb rbi rbk rbm rbo rbp rbr rbs ria rib rii rik rim rio rip rir ris rkb rkk rkm rko rkp rks rma rmb rmi rmm rmo rmp rmr rms roa rob roi rok rom roo rop ror ros rpa rpb rpi rpk rpm rpo rpp rpr rps rra rrb rri rrk rrm rrp rrr rrs rsa rsb rsi rsk rsm rso rsp rsr rss saa sab sai sak sam sao sap sar sas sba sbb sbi sbk sbm sbo sbp sbr sbs sia sib sii sik sim sio sip sir sis sk- ska skb ski skk skm sko skp skr sks sma smb smi smk smm smo smp smr sms soa sob soi sok som soo sop sor sos spa spb spi spk spm spo spp spr sps sr- sra srb sri srk srm sro srp srr srs ss- ssa ssb ssi ssk ssm sso ssp ssr sss