-er a-a a-b a-i a-t aaa aab aae aaf aai aak aan aao aar aat ab- aba abb abe abf abi abk abn abo abr abt aea aeb aee aef aei aek aen aeo aer aet af- afa afb afe aff afi afk afn afo afr aft ai- aia aib aie aif aii aik ain aio air ait aka akb ake aki akk akn ako akr an- ana anb ane anf ani ank ann ano anr ant aoa aob aoe aof aoi aok aon aoo aor aot ar- ara arb are arf ari ark arn aro arr art at- ata atb ate atf ati atn ato atr att baa bab bae baf bai bak ban bao bar bat bba bbb bbe bbf bbi bbk bbn bbo bbr bbt be- bea beb bee bef bei bek ben beo ber bet bfa bfb bfe bff bfi bfn bfo bfr bft bi- bia bib bie bif bii bik bin bio bir bit bka bkb bke bkf bkk bkn bko bkr bkt bna bnb bne bnf bni bnk bnn bno bnr bnt boa bob boe bof boi bok bon boo bor bot bra brb bre brf bri brk brn bro brr brt bta btb bte btf bti btk btn bto btr btt eaa eab eae eaf eai eak ean eao ear eat eba ebb ebe ebf ebi ebk ebn ebo ebr ebt eea eeb eee eef eek een eeo eer eet ef- efa efb efe eff efi efo efr eft eia eib eie eif eii eik ein eio eir eit eka ekb eke ekf eki eko ekr ekt en- ena enb ene enf eni enk enn eno enr ent eo- eoa eob eoe eof eoi eok eon eoo eor eot era erb ere erf eri erk ern ero err ert eta etb ete etf eti etk etn eto etr ett faa fab fae faf fai fak fan fao far fat fba fbb fbe fbf fbi fbk fbn fbo fbr fbt fea feb fee fef fei fek fen feo fer fet ffa ffe fff ffi ffk ffn ffo ffr fft fia fib fie fif fii fik fin fir fit fka fkb fkf fki fkk fkt fna fnb fne fnf fni fnk fnn fnr fnt foa fob foe fof foi fok fon foo for fot fra frb fre frf fri frk frn fro frr frt fta ftb fte ftf fti ftk ftn fto ftr ftt i-f ia- iaa iab iae iaf iai ian iao iar iat iba ibb ibe ibf ibi ibk ibn ibo ibr ibt ie- iea iee ief iei iek ien ier iet ifa ifb ife iff ifi ifn ifo ifr ift iia iib iie iif iii iin iio iir iit ika ikb ike ikf iki ikk iko ikr ikt in- ina inb ine inf ini ink inn ino inr int io- ioa iob ioe iof ioi ion ioo ior iot ir- ira irb ire irf iri irk irn iro irr irt ita itb ite itf iti itk itn ito itt k-t ka- kaa kab kae kaf kai kak kan kao kar kat kba kbb kbe kbf kbi kbk kbn kbo kbr ke- kea keb kee kef kei kek ken keo ker ket kfa kff kfi kfo kia kib kie kif kii kik kin kio kir kit kkb kke kki kkk kkn kkr kkt kn- kna kne knf kni knk knn kno knr knt koa kob koe kof koi kok kon koo kor kot kra krf kri krk krn kro krr krt kta ktb kte ktf ktk ktn kto ktr ktt n-i naa nab nae naf nai nak nan nao nar nat nba nbb nbe nbf nbi nbk nbn nbo nbr nbt ne- nea neb nee nef nei nek nen neo ner net nfa nfb nfe nff nfi nfk nfn nfo nfr nft nia nib nie nif nii nik nin nio nir nit nka nke nkf nki nkk nkn nko nkr nkt nna nnb nne nnf nni nnk nnn nno nnt no- noa nob noe nof noi nok non noo nor not nra nrb nre nrf nri nrk nrn nro nrr nrt nta ntb nte ntf nti ntk ntn nto ntr ntt o-i oaa oab oae oaf oai oak oan oao oar oat ob- oba obb obe obf obi obk obn obo obr obt oea oeb oee oef oei oen oeo oer oet of- ofa ofb ofe off ofi ofn ofo ofr oft oia oib oie oif oii oik oin oio oir oit oka okb oke oki okk oko okr on- ona onb one onf oni onk onn ono onr ont oo- ooa oob oof ooi ook oon ooo oor oot or- ora orb ore orf ori ork orn oro orr ort ot- ota otb ote otf oti otk otn oto otr ott ra- raa rab rae raf rai rak ran rao rar rat rba rbb rbe rbf rbi rbk rbn rbo rbr rbt re- rea reb ree ref rei rek ren reo rer ret rfa rfb rfe rff rfi rfk rfn rfo rfr rft ria rib rie rif rii rik rin rio rir rit rkb rke rkf rkk rko rkt rna rnb rni rnn rno rnr rnt roa rob roe rof roi rok ron roo ror rot rra rrb rrf rri rrk rrn rrr rrt rta rtb rte rtf rti rtk rtn rto rtr rtt taa tab tae taf tai tak tan tao tar tat tba tbb tbe tbf tbi tbk tbn tbo tbr tbt te- tea teb tee tef tei tek ten teo ter tet tfa tfb tfe tff tfi tfk tfn tfo tfr tft tia tib tie tif tii tik tin tio tir tit tka tkb tke tkk tko tkr tkt tna tnb tne tnf tni tnk tnn tno tnr tnt to- toa tob toe tof toi tok ton too tor tot tra trb tre trf tri trk trn tro trr trt tta ttb tte ttf tti ttk ttn tto ttr ttt