-er a-a a-b a-c aaa aab aac aad aae aak aao aap aar ab- aba abb abc abd abe abk abo abp abr ac- aca acb acc acd ace ack aco acp acr ad- ada adb adc add ade adk ado adp adr aea aeb aec aed aee aek aeo aep aer aka akb akc akd ake akk ako akp akr aoa aob aoc aod aoe aok aoo aop aor ap- apa apb apc apd ape apk apo app apr ar- ara arb arc ard are ark aro arp arr b-p baa bab bac bad bae bak bao bap bar bba bbb bbc bbd bbe bbk bbo bbp bbr bca bcb bcc bcd bce bck bco bcp bcr bda bdb bdc bdd bde bdk bdo bdp bdr be- bea beb bec bed bee bek beo bep ber bka bkb bkc bke bkk bko bkp bkr boa bob boc bod boe bok boo bop bor bpa bpb bpc bpd bpe bpo bpp bpr bra brb brd bre brk bro brp brr c-- caa cab cac cad cae cak cao cap car cba cbb cbc cbd cbe cbk cbo cbp cbr cca ccb ccc ccd cce cck cco ccp ccr cda cdb cdc cdd cde cdk cdo cdp cdr ce- cea ceb cec ced cee cek ceo cep cer cka ckb ckc ckd cko co- coa cob coc cod coe cok coo cop cor cpa cpb cpc cpd cpe cpk cpo cpp cpr cra crb crc crd cre crk cro crp crr daa dab dac dad dae dak dao dap dar dba dbb dbc dbd dbe dbk dbo dbp dbr dca dcb dcc dcd dce dck dco dcp dcr dda ddb ddc ddd dde ddk ddo ddp ddr de- dea deb dec ded dee dek deo dep der dka dkb dkc dke dkk dko dkp dkr doa dob doc dod doe dok doo dop dor dpa dpb dpc dpd dpe dpk dpo dpp dpr dra drb drc drd dre drk dro drp drr eaa eab eac ead eae eak eao eap ear eba ebb ebc ebd ebe ebk ebo ebp ebr ec- eca ecb ecc ecd ece eck eco ecr ed- eda edb edc edd ede edk edo edp edr eea eeb eec eed eee eek eeo eep eer eka ekb ekc ekd eke eko ekp ekr eo- eoa eob eoc eod eoe eok eoo eop eor ep- epa epb epc epd epe epo epp epr era erb erc erd ere erk ero erp err ka- kaa kab kac kad kae kak kao kap kar kba kbb kbc kbd kbe kbk kbo kbp kbr kca kcb kcc kcd kce kck kcp kcr kda kdb kdc kde kdk kdo kdp kdr ke- kea keb kec ked kee kek keo kep ker kkb kkc kke kkk kkp kkr koa kob koc kod koe kok koo kop kor kpa kpc kpd kpe kpk kpo kpp kpr kra krc krd krk kro krp krr oaa oab oac oad oae oak oao oap oar ob- oba obb obc obd obe obk obo obp obr oc- oca ocb occ ocd ock oco ocp ocr oda odb odc odd ode odo odp odr oea oeb oec oed oee oeo oep oer oka okb okc okd oke okk oko okp okr oo- ooa oob ooc ood ook ooo oop oor op- opa opb opc opd ope opk opo opp opr or- ora orb orc ord ore ork oro orp orr p-p paa pab pac pad pae pak pao pap par pba pbb pbc pbd pbe pbk pbo pbp pbr pca pcb pcc pcd pce pck pco pcp pcr pda pdb pdc pdd pde pdk pdo pdp pdr pea peb pec ped pee pek peo pep per pka pkb pkc pkd pke pko pkp pkr poa pob poc pod poe pok poo pop por ppa ppb ppc ppd ppe ppk ppo ppp ppr pra prb prc prd pre prk pro prp prr ra- raa rab rac rad rae rak rao rap rar rba rbb rbc rbd rbe rbk rbo rbp rbr rca rcb rcc rcd rce rco rcp rcr rda rdb rdc rdd rde rdo rdp rdr re- rea reb rec red ree rek reo rep rer rkb rkc rke rkk rko rkp roa rob roc rod roe rok roo rop ror rpa rpb rpc rpd rpe rpk rpo rpp rpr rra rrb rrc rrd rrk rrp rrr

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