-er a-a a-b a-i a-t aaa aab aad aae aai aan aao aar aat ab- aba abb abd abe abi abn abo abr abt ad- ada adb add ade adi adn ado adr adt aea aeb aed aee aei aen aeo aer aet ai- aia aib aid aie aii ain aio air ait an- ana anb and ane ani ann ano anr ant aoa aob aod aoe aoi aon aoo aor aot ar- ara arb ard are ari arn aro arr art at- ata atb atd ate ati atn ato atr att baa bab bad bae bai ban bao bar bat bba bbb bbd bbe bbi bbn bbo bbr bbt bda bdb bdd bde bdi bdo bdr bdt be- bea beb bed bee bei ben beo ber bet bi- bia bib bid bie bii bin bio bir bit bna bnb bnd bne bni bnn bno bnr bnt boa bob bod boe boi bon boo bor bot bra brb brd bre bri brn bro brr brt bta btb btd bte bti btn bto btr btt daa dab dad dae dai dan dao dar dat dba dbb dbd dbe dbi dbn dbo dbr dbt dda ddb ddd dde ddi ddn ddo ddr ddt de- dea deb ded dee dei den deo der det di- dia dib did die dii din dio dir dit dna dnb dnd dne dni dnn dno dnr dnt doa dob dod doe doi don doo dor dot dra drb drd dre dri drn dro drr drt dta dtb dtd dte dti dtn dto dtr dtt eaa eab ead eae eai ean eao ear eat eba ebb ebd ebe ebi ebn ebo ebr ebt ed- eda edb edd ede edi edn edo edr edt eea eeb eed eee een eeo eer eet eia eib eid eie eii ein eio eir eit en- ena enb end ene eni enn eno enr ent eo- eoa eob eod eoe eoi eon eoo eor eot era erb erd ere eri ern ero err ert eta etb etd ete eti etn eto etr ett i-d ia- iaa iab iad iae iai ian iao iar iat iba ibb ibd ibe ibi ibn ibo ibr ibt ida idb idd ide idi idn ido idr idt ie- iea ied iee iei ien ier iet iia iib iid iie iii iin iio iir iit in- ina inb ind ine ini inn ino inr int io- ioa iob iod ioe ioi ion ioo ior iot ir- ira irb ird ire iri irn iro irr irt ita itb itd ite iti itn ito itt n-i naa nab nad nae nai nan nao nar nat nba nbb nbd nbe nbi nbn nbo nbr nbt nda ndb ndd nde ndi ndn ndo ndr ndt ne- nea neb ned nee nei nen neo ner net nia nib nid nie nii nin nio nir nit nna nnb nne nni nnn nno nnt no- noa nob nod noe noi non noo nor not nra nrb nrd nre nri nrn nro nrr nrt nta ntb ntd nte nti ntn nto ntr ntt o-i oaa oab oad oae oai oan oao oar oat ob- oba obb obd obe obi obn obo obr obt oda odb odd ode odi odn odo odr odt oea oeb oed oee oei oen oeo oer oet oia oib oid oie oii oin oio oir oit on- ona onb ond one oni onn ono onr ont oo- ooa oob ood ooi oon ooo oor oot or- ora orb ord ore ori orn oro orr ort ot- ota otb otd ote oti otn oto otr ott ra- raa rab rad rae rai ran rao rar rat rba rbb rbd rbe rbi rbn rbo rbr rbt rda rdb rdd rde rdi rdn rdo rdr rdt re- rea reb red ree rei ren reo rer ret ria rib rid rie rii rin rio rir rit rna rnb rnd rni rnn rno rnr rnt roa rob rod roe roi ron roo ror rot rra rrb rrd rri rrn rrr rrt rta rtb rtd rte rti rtn rto rtr rtt taa tab tad tae tai tan tao tar tat tba tbb tbd tbe tbi tbn tbo tbr tbt tda tdb tdd tde tdi tdn tdo tdr tdt te- tea teb ted tee tei ten teo ter tet tia tib tid tie tii tin tio tir tit tna tnb tnd tne tni tnn tno tnr tnt to- toa tob tod toe toi ton too tor tot tra trb trd tre tri trn tro trr trt tta ttb ttd tte tti ttn tto ttr ttt