-er a-a a-b a-i a-t aaa aab aad aae aai aao aap aar aat ab- aba abb abd abe abi abo abp abr abt ad- ada adb add ade adi ado adp adr adt aea aeb aed aee aei aeo aep aer aet ai- aia aib aid aie aii aio aip air ait aoa aob aod aoe aoi aoo aop aor aot ap- apa apb apd ape api apo app apr apt ar- ara arb ard are ari aro arp arr art at- ata atb atd ate ati ato atp atr att b-p baa bab bad bae bai bao bap bar bat bba bbb bbd bbe bbi bbo bbp bbr bbt bda bdb bdd bde bdi bdo bdp bdr bdt be- bea beb bed bee bei beo bep ber bet bi- bia bib bid bie bii bio bip bir bit boa bob bod boe boi boo bop bor bot bpa bpb bpd bpe bpi bpo bpp bpr bpt bra brb brd bre bri bro brp brr brt bta btb btd bte bti bto btp btr btt daa dab dad dae dai dao dap dar dat dba dbb dbd dbe dbi dbo dbp dbr dbt dda ddb ddd dde ddi ddo ddp ddr ddt de- dea deb ded dee dei deo dep der det di- dia dib did die dii dio dip dir dit doa dob dod doe doi doo dop dor dot dpa dpb dpd dpe dpi dpo dpp dpr dpt dra drb drd dre dri dro drp drr drt dta dtb dtd dte dti dto dtp dtr dtt eaa eab ead eae eai eao eap ear eat eba ebb ebd ebe ebi ebo ebp ebr ebt ed- eda edb edd ede edi edo edp edr edt eea eeb eed eee eeo eep eer eet eia eib eid eie eii eio eip eir eit eo- eoa eob eod eoe eoi eoo eop eor eot ep- epa epb epd epe epi epo epp epr ept era erb erd ere eri ero erp err ert eta etb etd ete eti eto etp etr ett i-d ia- iaa iab iad iae iai iao iap iar iat iba ibb ibd ibe ibi ibo ibp ibr ibt ida idb idd ide idi ido idp idr idt ie- iea ied iee iei iep ier iet iia iib iid iie iii iio iip iir iit io- ioa iob iod ioe ioi ioo iop ior iot ipa ipb ipd ipe ipi ipo ipp ipr ipt ir- ira irb ird ire iri iro irp irr irt ita itb itd ite iti ito itp itt o-i oaa oab oad oae oai oao oap oar oat ob- oba obb obd obe obi obo obp obr obt oda odb odd ode odi odo odp odr odt oea oeb oed oee oei oeo oep oer oet oia oib oid oie oii oio oip oir oit oo- ooa oob ood ooi ooo oop oor oot op- opa opb opd ope opi opo opp opr opt or- ora orb ord ore ori oro orp orr ort ot- ota otb otd ote oti oto otp otr ott p-p paa pab pad pae pai pao pap par pat pba pbb pbd pbe pbi pbo pbp pbr pbt pda pdb pdd pde pdi pdo pdp pdr pdt pea peb ped pee pei peo pep per pet pia pib pid pie pii pio pip pir pit poa pob pod poe poi poo pop por pot ppa ppb ppd ppe ppi ppo ppp ppr ppt pra prb prd pre pri pro prp prr prt pt- pta ptb ptd pte pti pto ptp ptr ptt ra- raa rab rad rae rai rao rap rar rat rba rbb rbd rbe rbi rbo rbp rbr rbt rda rdb rdd rde rdi rdo rdp rdr rdt re- rea reb red ree rei reo rep rer ret ria rib rid rie rii rio rip rir rit roa rob rod roe roi roo rop ror rot rpa rpb rpd rpe rpi rpo rpp rpr rpt rra rrb rrd rri rrp rrr rrt rta rtb rtd rte rti rto rtp rtr rtt taa tab tad tae tai tao tap tar tat tba tbb tbd tbe tbi tbo tbp tbr tbt tda tdb tdd tde tdi tdo tdp tdr tdt te- tea teb ted tee tei teo tep ter tet tia tib tid tie tii tio tip tir tit to- toa tob tod toe toi too top tor tot tpa tpb tpd tpe tpi tpo tpp tpr tpt tra trb trd tre tri tro trp trr trt tta ttb ttd tte tti tto ttp ttr ttt