-er a-a a-b a-c aaa aab aac aae aak aam aao aap aar ab- aba abb abc abe abk abm abo abp abr ac- aca acb acc ace ack acm aco acp acr aea aeb aec aee aek aem aeo aep aer aka akb akc ake akk akm ako akp akr ama amb amc ame amk amm amo amp amr aoa aob aoc aoe aok aom aoo aop aor ap- apa apb apc ape apk apm apo app apr ar- ara arb arc are ark arm aro arp arr b-p baa bab bac bae bak bam bao bap bar bba bbb bbc bbe bbk bbm bbo bbp bbr bca bcb bcc bce bck bcm bco bcp bcr be- bea beb bec bee bek bem beo bep ber bka bkb bkc bke bkk bkm bko bkp bkr bma bmb bmc bme bmk bmm bmo bmp bmr boa bob boc boe bok bom boo bop bor bpa bpb bpc bpe bpm bpo bpp bpr bra brb bre brk brm bro brp brr c-- caa cab cac cae cak cam cao cap car cba cbb cbc cbe cbk cbm cbo cbp cbr cca ccb ccc cce cck ccm cco ccp ccr ce- cea ceb cec cee cek cem ceo cep cer cka ckb ckc ckm cko cma cmb cmc cme cmk cmm cmo cmp cmr co- coa cob coc coe cok com coo cop cor cpa cpb cpc cpe cpk cpm cpo cpp cpr cra crb crc cre crk crm cro crp crr eaa eab eac eae eak eam eao eap ear eba ebb ebc ebe ebk ebm ebo ebp ebr ec- eca ecb ecc ece eck ecm eco ecr eea eeb eec eee eek eem eeo eep eer eka ekb ekc eke eko ekp ekr em- ema emb emc eme emk emm emo emp emr eo- eoa eob eoc eoe eok eom eoo eop eor ep- epa epb epc epe epm epo epp epr era erb erc ere erk erm ero erp err ka- kaa kab kac kae kak kam kao kap kar kba kbb kbc kbe kbk kbm kbo kbp kbr kca kcb kcc kce kck kcm kcp kcr ke- kea keb kec kee kek kem keo kep ker kkb kkc kke kkk kkm kkp kkr kma kmb kmc kme kmk kmm kmo kmp koa kob koc koe kok kom koo kop kor kpa kpc kpe kpk kpm kpo kpp kpr kra krc krk kro krp krr m-o m-r maa mab mac mae mak mam mao map mar mba mbb mbc mbe mbk mbm mbo mbp mbr mc- mca mcb mcc mce mck mcm mco mcp mcr mea meb mec mee mek mem meo mep mer mka mkb mkc mke mkk mkm mko mkp mkr mma mmb mmc mme mmk mmm mmo mmp mmr moa mob moc moe mok mom moo mop mor mpa mpb mpc mpe mpk mpm mpo mpp mpr mra mrb mrc mre mrk mrm mro mrp mrr oaa oab oac oae oak oam oao oap oar ob- oba obb obc obe obk obm obo obp obr oc- oca ocb occ ock ocm oco ocp ocr oea oeb oec oee oem oeo oep oer oka okb okc oke okk oko okp okr om- oma omb omc ome omm omo omp omr oo- ooa oob ooc ook oom ooo oop oor op- opa opb opc ope opk opm opo opp opr or- ora orb orc ore ork orm oro orp orr p-p paa pab pac pae pak pam pao pap par pba pbb pbc pbe pbk pbm pbo pbp pbr pca pcb pcc pce pck pcm pco pcp pcr pea peb pec pee pek pem peo pep per pka pkb pkc pke pkm pko pkp pkr pma pmb pmc pme pmk pmm pmo pmp pmr poa pob poc poe pok pom poo pop por ppa ppb ppc ppe ppk ppm ppo ppp ppr pra prb prc pre prk prm pro prp prr ra- raa rab rac rae rak ram rao rap rar rba rbb rbc rbe rbk rbm rbo rbp rbr rca rcb rcc rce rcm rco rcp rcr re- rea reb rec ree rek rem reo rep rer rkb rkc rke rkk rkm rko rkp rma rmb rmc rme rmm rmo rmp rmr roa rob roc roe rok rom roo rop ror rpa rpb rpc rpe rpk rpm rpo rpp rpr rra rrb rrc rrk rrm rrp rrr

a-ak a-be a-ok aaaa aaab aaac aaae aaam aaap aaar aaba aabb aabc aabm aabp aaca aacb aacc aace aack aacm aaco aacp aacr aaea aaec aaem aaep aaka aake aama aamb aamc aame aamo aamp aamr aaoe aaoo aapa aapc aapm aapo aara aarc aare aarm aaro aarp abaa abab abac abae abak abam abap abar abb- abba abbb abbe abbo abbr abca abcb abcc abcp abcr abec abee aber abma abmb abmc aboa abob abok aboo abor abpa abpc abpm abpp abpr abra abrc abro acaa acab acac acae acap acar acba acca accc acce accm acco accp ace- acea acec acek acem acer acke acma acmc acme acmp acoa acoe acom acop acor acpa acpe acpm acpr acr- acra acrc acre acrm acro acrr aeac aeap aecb aeer aeka aeom aer- aera aerc aero akaa akae akam akao akap akar akca akee aker akka akko akok akom akpo akr- akra akre amaa amac amae amam amap amar amb- amba ambe ambo ambr amca amcc amco amec amee amer amka amm- amma amme ammo amob amoc amok amoo amor ampa ampc ampe ampk ampm ampo amra amrc amro aoba aoca aoce aokp aoma aopo aora aorb apac apak apam apao apap apar apba apbr apca apcb apcc apcm apco apcr apea apec apem apep aper apke apma apo- apoc apoe apom apoo apop apor appa appc appr apra aprc apre apro arab arac arae arak aram arap arar arba arbe arc- arca arce arcm arco area arec aree arek arem areo arep arka arke arko arma armc arme armm armo aroa arob aroe arom aroo aror arpa arpe