-er a-a a-b a-t aaa aab aad aae aan aao aap aar aat ab- aba abb abd abe abn abo abp abr abt ad- ada adb add ade adn ado adp adr adt aea aeb aed aee aen aeo aep aer aet an- ana anb and ane ann ano anp anr ant aoa aob aod aoe aon aoo aop aor aot ap- apa apb apd ape apn apo app apr apt ar- ara arb ard are arn aro arp arr art at- ata atb atd ate atn ato atp atr att b-p baa bab bad bae ban bao bap bar bat bba bbb bbd bbe bbn bbo bbp bbr bbt bda bdb bdd bde bdo bdp bdr bdt be- bea beb bed bee ben beo bep ber bet bna bnb bnd bne bnn bno bnp bnr bnt boa bob bod boe bon boo bop bor bot bpa bpb bpd bpe bpn bpo bpp bpr bpt bra brb brd bre brn bro brp brr brt bta btb btd bte btn bto btp btr btt daa dab dad dae dan dao dap dar dat dba dbb dbd dbe dbn dbo dbp dbr dbt dda ddb ddd dde ddn ddo ddp ddr ddt de- dea deb ded dee den deo dep der det dna dnb dnd dne dnn dno dnp dnr dnt doa dob dod doe don doo dop dor dot dpa dpb dpd dpe dpn dpo dpp dpr dpt dra drb drd dre drn dro drp drr drt dta dtb dtd dte dtn dto dtp dtr dtt eaa eab ead eae ean eao eap ear eat eba ebb ebd ebe ebn ebo ebp ebr ebt ed- eda edb edd ede edn edo edp edr edt eea eeb eed eee een eeo eep eer eet en- ena enb end ene enn eno enp enr ent eo- eoa eob eod eoe eon eoo eop eor eot ep- epa epb epd epe epn epo epp epr ept era erb erd ere ern ero erp err ert eta etb etd ete etn eto etp etr ett naa nab nad nae nan nao nap nar nat nba nbb nbd nbe nbn nbo nbp nbr nbt nda ndb ndd nde ndn ndo ndp ndr ndt ne- nea neb ned nee nen neo nep ner net nna nnb nne nnn nno nnp nnt no- noa nob nod noe non noo nop nor not npa npb npd npe npn npo npp npr npt nra nrb nrd nre nrn nro nrp nrr nrt nta ntb ntd nte ntn nto ntp ntr ntt oaa oab oad oae oan oao oap oar oat ob- oba obb obd obe obn obo obp obr obt oda odb odd ode odn odo odp odr odt oea oeb oed oee oen oeo oep oer oet on- ona onb ond one onn ono onp onr ont oo- ooa oob ood oon ooo oop oor oot op- opa opb opd ope opn opo opp opr opt or- ora orb ord ore orn oro orp orr ort ot- ota otb otd ote otn oto otp otr ott p-p paa pab pad pae pan pao pap par pat pba pbb pbd pbe pbn pbo pbp pbr pbt pda pdb pdd pde pdn pdo pdp pdr pdt pea peb ped pee pen peo pep per pet pn- pna pnb pnd pne pnn pno pnp pnr pnt poa pob pod poe pon poo pop por pot ppa ppb ppd ppe ppn ppo ppp ppr ppt pra prb prd pre prn pro prp prr prt pt- pta ptb ptd pte ptn pto ptp ptr ptt ra- raa rab rad rae ran rao rap rar rat rba rbb rbd rbe rbn rbo rbp rbr rbt rda rdb rdd rde rdn rdo rdp rdr rdt re- rea reb red ree ren reo rep rer ret rna rnb rnd rnn rno rnp rnr rnt roa rob rod roe ron roo rop ror rot rpa rpb rpd rpe rpn rpo rpp rpr rpt rra rrb rrd rrn rrp rrr rrt rta rtb rtd rte rtn rto rtp rtr rtt taa tab tad tae tan tao tap tar tat tba tbb tbd tbe tbn tbo tbp tbr tbt tda tdb tdd tde tdn tdo tdp tdr tdt te- tea teb ted tee ten teo tep ter tet tna tnb tnd tne tnn tno tnp tnr tnt to- toa tob tod toe ton too top tor tot tpa tpb tpd tpe tpn tpo tpp tpr tpt tra trb trd tre trn tro trp trr trt tta ttb ttd tte ttn tto ttp ttr ttt