-er a-a a-b a-i a-t aaa aab aae aai aam aao aap aar aat ab- aba abb abe abi abm abo abp abr abt aea aeb aee aei aem aeo aep aer aet ai- aia aib aie aii aim aio aip air ait ama amb ame ami amm amo amp amr amt aoa aob aoe aoi aom aoo aop aor aot ap- apa apb ape api apm apo app apr apt ar- ara arb are ari arm aro arp arr art at- ata atb ate ati atm ato atp atr att b-p baa bab bae bai bam bao bap bar bat bba bbb bbe bbi bbm bbo bbp bbr bbt be- bea beb bee bei bem beo bep ber bet bi- bia bib bie bii bim bio bip bir bit bma bmb bme bmi bmm bmo bmp bmr bmt boa bob boe boi bom boo bop bor bot bpa bpb bpe bpi bpm bpo bpp bpr bpt bra brb bre bri brm bro brp brr brt bta btb bte bti btm bto btp btr btt eaa eab eae eai eam eao eap ear eat eba ebb ebe ebi ebm ebo ebp ebr ebt eea eeb eee eem eeo eep eer eet eia eib eie eii eim eio eip eir eit em- ema emb eme emi emm emo emp emr emt eo- eoa eob eoe eoi eom eoo eop eor eot ep- epa epb epe epi epm epo epp epr ept era erb ere eri erm ero erp err ert eta etb ete eti etm eto etp etr ett ia- iaa iab iae iai iam iao iap iar iat iba ibb ibe ibi ibm ibo ibp ibr ibt ie- iea iee iei iem iep ier iet iia iib iie iii iim iio iip iir iit im- ima imb ime imi imm imo imp imt io- ioa iob ioe ioi iom ioo iop ior iot ipa ipb ipe ipi ipm ipo ipp ipr ipt ir- ira irb ire iri irm iro irp irr irt ita itb ite iti itm ito itp itt m-o m-r maa mab mae mai mam mao map mar mat mba mbb mbe mbi mbm mbo mbp mbr mbt mea meb mee mei mem meo mep mer met mi- mia mib mie mii mim mio mip mir mit mma mmb mme mmi mmm mmo mmp mmr mmt moa mob moe moi mom moo mop mor mot mpa mpb mpe mpi mpm mpo mpp mpr mpt mra mrb mre mri mrm mro mrp mrr mrt mta mtb mte mti mtm mto mtp mtr mtt o-i oaa oab oae oai oam oao oap oar oat ob- oba obb obe obi obm obo obp obr obt oea oeb oee oei oem oeo oep oer oet oia oib oie oii oim oio oip oir oit om- oma omb ome omi omm omo omp omr omt oo- ooa oob ooi oom ooo oop oor oot op- opa opb ope opi opm opo opp opr opt or- ora orb ore ori orm oro orp orr ort ot- ota otb ote oti otm oto otp otr ott p-p paa pab pae pai pam pao pap par pat pba pbb pbe pbi pbm pbo pbp pbr pbt pea peb pee pei pem peo pep per pet pia pib pie pii pim pio pip pir pit pma pmb pme pmi pmm pmo pmp pmr pmt poa pob poe poi pom poo pop por pot ppa ppb ppe ppi ppm ppo ppp ppr ppt pra prb pre pri prm pro prp prr prt pt- pta ptb pte pti ptm pto ptp ptr ptt ra- raa rab rae rai ram rao rap rar rat rba rbb rbe rbi rbm rbo rbp rbr rbt re- rea reb ree rei rem reo rep rer ret ria rib rie rii rim rio rip rir rit rma rmb rme rmi rmm rmo rmp rmr rmt roa rob roe roi rom roo rop ror rot rpa rpb rpe rpi rpm rpo rpp rpr rpt rra rrb rri rrm rrp rrr rrt rta rtb rte rti rtm rto rtp rtr rtt taa tab tae tai tam tao tap tar tat tba tbb tbe tbi tbm tbo tbp tbr tbt te- tea teb tee tei tem teo tep ter tet tia tib tie tii tim tio tip tir tit tma tmb tme tmi tmm tmo tmp tmr tmt to- toa tob toe toi tom too top tor tot tpa tpb tpe tpi tpm tpo tpp tpr tpt tra trb tre tri trm tro trp trr trt tta ttb tte tti ttm tto ttp ttr ttt