-er a-a a-b a-t aaa aab aad aae aao aap aar aat ab- aba abb abd abe abo abp abr abt ad- ada adb add ade ado adp adr adt aea aeb aed aee aeo aep aer aet aoa aob aod aoe aoo aop aor aot ap- apa apb apd ape apo app apr apt ar- ara arb ard are aro arp arr art at- ata atb atd ate ato atp atr att b-p baa bab bad bae bao bap bar bat bba bbb bbd bbe bbo bbp bbr bbt bda bdb bdd bde bdo bdp bdr bdt be- bea beb bed bee beo bep ber bet boa bob bod boe boo bop bor bot bpa bpb bpd bpe bpo bpp bpr bpt bra brb brd bre bro brp brr brt bta btb btd bte bto btp btr btt daa dab dad dae dao dap dar dat dba dbb dbd dbe dbo dbp dbr dbt dda ddb ddd dde ddo ddp ddr ddt de- dea deb ded dee deo dep der det doa dob dod doe doo dop dor dot dpa dpb dpd dpe dpo dpp dpr dpt dra drb drd dre dro drp drr drt dta dtb dtd dte dto dtp dtr dtt eaa eab ead eae eao eap ear eat eba ebb ebd ebe ebo ebp ebr ebt ed- eda edb edd ede edo edp edr edt eea eeb eed eee eeo eep eer eet eo- eoa eob eod eoe eoo eop eor eot ep- epa epb epd epe epo epp epr ept era erb erd ere ero erp err ert eta etb etd ete eto etp etr ett oaa oab oad oae oao oap oar oat ob- oba obb obd obe obo obp obr obt oda odb odd ode odo odp odr odt oea oeb oed oee oeo oep oer oet oo- ooa oob ood ooo oop oor oot op- opa opb opd ope opo opp opr opt or- ora orb ord ore oro orp orr ort ot- ota otb otd ote oto otp otr ott p-p paa pab pad pae pao pap par pat pba pbb pbd pbe pbo pbp pbr pbt pda pdb pdd pde pdo pdp pdr pdt pea peb ped pee peo pep per pet poa pob pod poe poo pop por pot ppa ppb ppd ppe ppo ppp ppr ppt pra prb prd pre pro prp prr prt pt- pta ptb ptd pte pto ptp ptr ptt ra- raa rab rad rae rao rap rar rat rba rbb rbd rbe rbo rbp rbr rbt rda rdb rdd rde rdo rdp rdr rdt re- rea reb red ree reo rep rer ret roa rob rod roe roo rop ror rot rpa rpb rpd rpe rpo rpp rpr rpt rra rrb rrd rrp rrr rrt rta rtb rtd rte rto rtp rtr rtt taa tab tad tae tao tap tar tat tba tbb tbd tbe tbo tbp tbr tbt tda tdb tdd tde tdo tdp tdr tdt te- tea teb ted tee teo tep ter tet to- toa tob tod toe too top tor tot tpa tpb tpd tpe tpo tpp tpr tpt tra trb trd tre tro trp trr trt tta ttb ttd tte tto ttp ttr ttt