-er a-a a-b a-i a-t aaa aab aae aaf aai aak aan aar aat ab- aba abb abe abf abi abk abn abr abt aea aeb aee aef aei aek aen aer aet af- afa afb afe aff afi afk afn afr aft ai- aia aib aie aif aii aik ain air ait aka akb ake aki akk akn akr an- ana anb ane anf ani ank ann anr ant ar- ara arb are arf ari ark arn arr art at- ata atb ate atf ati atn atr att baa bab bae baf bai bak ban bar bat bba bbb bbe bbf bbi bbk bbn bbr bbt be- bea beb bee bef bei bek ben ber bet bfa bfb bfe bff bfi bfn bfr bft bi- bia bib bie bif bii bik bin bir bit bka bkb bke bkf bkk bkn bkr bkt bna bnb bne bnf bni bnk bnn bnr bnt bra brb bre brf bri brk brn brr brt bta btb bte btf bti btk btn btr btt eaa eab eae eaf eai eak ean ear eat eba ebb ebe ebf ebi ebk ebn ebr ebt eea eeb eee eef eek een eer eet ef- efa efb efe eff efi efr eft eia eib eie eif eii eik ein eir eit eka ekb eke ekf eki ekr ekt en- ena enb ene enf eni enk enn enr ent era erb ere erf eri erk ern err ert eta etb ete etf eti etk etn etr ett faa fab fae faf fai fak fan far fat fba fbb fbe fbf fbi fbk fbn fbr fbt fea feb fee fef fei fek fen fer fet ffa ffe fff ffi ffk ffn 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 fra frb fre frf fri frk frn frr frt fta ftb fte ftf fti ftk ftn ftr ftt i-f ia- iaa iab iae iaf iai ian iar iat iba ibb ibe ibf ibi ibk ibn ibr ibt ie- iea iee ief iei iek ien ier iet ifa ifb ife iff ifi ifn ifr ift iia iib iie iif iii iin iir iit ika ikb ike ikf iki ikk ikr ikt in- ina inb ine inf ini ink inn inr int ir- ira irb ire irf iri irk irn irr irt ita itb ite itf iti itk itn itt k-t ka- kaa kab kae kaf kai kak kan kar kat kba kbb kbe kbf kbi kbk kbn kbr ke- kea keb kee kef kei kek ken ker ket kfa kff kfi kia kib kie kif kii kik kin kir kit kkb kke kki kkk kkn kkr kkt kn- kna kne knf kni knk knn knr knt kra krf kri krk krn krr krt kta ktb kte ktf ktk ktn ktr ktt n-i naa nab nae naf nai nak nan nar nat nba nbb nbe nbf nbi nbk nbn nbr nbt ne- nea neb nee nef nei nek nen ner net nfa nfb nfe nff nfi nfk nfn nfr nft nia nib nie nif nii nik nin nir nit nka nke nkf nki nkk nkn nkr nkt nna nnb nne nnf nni nnk nnn nnt nra nrb nre nrf nri nrk nrn nrr nrt nta ntb nte ntf nti ntk ntn ntr ntt ra- raa rab rae raf rai rak ran rar rat rba rbb rbe rbf rbi rbk rbn rbr rbt re- rea reb ree ref rei rek ren rer ret rfa rfb rfe rff rfi rfk rfn rfr rft ria rib rie rif rii rik rin rir rit rkb rke rkf rkk rkt rna rnb rni rnn rnr rnt rra rrb rrf rri rrk rrn rrr rrt rta rtb rte rtf rti rtk rtn rtr rtt taa tab tae taf tai tak tan tar tat tba tbb tbe tbf tbi tbk tbn tbr tbt te- tea teb tee tef tei tek ten ter tet tfa tfb tfe tff tfi tfk tfn tfr tft tia tib tie tif tii tik tin tir tit tka tkb tke tkk tkr tkt tna tnb tne tnf tni tnk tnn tnr tnt tra trb tre trf tri trk trn trr trt tta ttb tte ttf tti ttk ttn ttr ttt