-er a-a a-b a-c a-t aaa aab aac aae aam aao aap aar aat ab- aba abb abc abe abm abo abp abr abt ac- aca acb acc ace acm aco acp acr act aea aeb aec aee aem aeo aep aer aet ama amb amc ame amm amo amp amr amt aoa aob aoc aoe aom aoo aop aor aot ap- apa apb apc ape apm apo app apr apt ar- ara arb arc are arm aro arp arr art at- ata atb atc ate atm ato atp atr att b-p baa bab bac bae bam bao bap bar bat bba bbb bbc bbe bbm bbo bbp bbr bbt bca bcb bcc bce bcm bco bcp bcr bct be- bea beb bec bee bem beo bep ber bet bma bmb bmc bme bmm bmo bmp bmr bmt boa bob boc boe bom boo bop bor bot bpa bpb bpc bpe bpm bpo bpp bpr bpt bra brb bre brm bro brp brr brt bta btb btc bte btm bto btp btr btt c-- caa cab cac cae cam cao cap car cat cba cbb cbc cbe cbm cbo cbp cbr cbt cca ccb ccc cce ccm cco ccp ccr cct ce- cea ceb cec cee cem ceo cep cer cet cma cmb cmc cme cmm cmo cmp cmr cmt co- coa cob coc coe com coo cop cor cot cpa cpb cpc cpe cpm cpo cpp cpr cpt cra crb crc cre crm cro crp crr crt cta ctb ctc cte ctm cto ctp ctr ctt eaa eab eac eae eam eao eap ear eat eba ebb ebc ebe ebm ebo ebp ebr ebt ec- eca ecb ecc ece ecm eco ecr ect eea eeb eec eee eem eeo eep eer eet em- ema emb emc eme emm emo emp emr emt eo- eoa eob eoc eoe eom eoo eop eor eot ep- epa epb epc epe epm epo epp epr ept era erb erc ere erm ero erp err ert eta etb etc ete etm eto etp etr ett m-o m-r maa mab mac mae mam mao map mar mat mba mbb mbc mbe mbm mbo mbp mbr mbt mc- mca mcb mcc mce mcm mco mcp mcr mct mea meb mec mee mem meo mep mer met mma mmb mmc mme mmm mmo mmp mmr mmt moa mob moc moe mom moo mop mor mot mpa mpb mpc mpe mpm mpo mpp mpr mpt mra mrb mrc mre mrm mro mrp mrr mrt mta mtb mtc mte mtm mto mtp mtr mtt oaa oab oac oae oam oao oap oar oat ob- oba obb obc obe obm obo obp obr obt oc- oca ocb occ ocm oco ocp ocr oct oea oeb oec oee oem oeo oep oer oet om- oma omb omc ome omm omo omp omr omt oo- ooa oob ooc oom ooo oop oor oot op- opa opb opc ope opm opo opp opr opt or- ora orb orc ore orm oro orp orr ort ot- ota otb otc ote otm oto otp otr ott p-p paa pab pac pae pam pao pap par pat pba pbb pbc pbe pbm pbo pbp pbr pbt pca pcb pcc pce pcm pco pcp pcr pct pea peb pec pee pem peo pep per pet pma pmb pmc pme pmm pmo pmp pmr pmt poa pob poc poe pom poo pop por pot ppa ppb ppc ppe ppm ppo ppp ppr ppt pra prb prc pre prm pro prp prr prt pt- pta ptb ptc pte ptm pto ptp ptr ptt ra- raa rab rac rae ram rao rap rar rat rba rbb rbc rbe rbm rbo rbp rbr rbt rca rcb rcc rce rcm rco rcp rcr rct re- rea reb rec ree rem reo rep rer ret rma rmb rmc rme rmm rmo rmp rmr rmt roa rob roc roe rom roo rop ror rot rpa rpb rpc rpe rpm rpo rpp rpr rpt rra rrb rrc rrm rrp rrr rrt rta rtb rtc rte rtm rto rtp rtr rtt taa tab tac tae tam tao tap tar tat tba tbb tbc tbe tbm tbo tbp tbr tbt tca tcb tcc tce tcm tco tcp tcr tct te- tea teb tec tee tem teo tep ter tet tma tmb tmc tme tmm tmo tmp tmr tmt to- toa tob toc toe tom too top tor tot tpa tpb tpc tpe tpm tpo tpp tpr tpt tra trb trc tre trm tro trp trr trt tta ttb ttc tte ttm tto ttp ttr ttt