-er a-a a-b a-i a-t aaa aab aae aaf aag aai aan aar aat ab- aba abb abe abf abg abi abn abr abt aea aeb aee aef aeg aei aen aer aet af- afa afb afe aff afg afi afn afr aft ag- aga agb age agf agg agi agn agr agt ai- aia aib aie aif aig aii ain air ait an- ana anb ane anf ang ani ann anr ant ar- ara arb are arf arg ari arn arr art at- ata atb ate atf atg ati atn atr att baa bab bae baf bag bai ban bar bat bba bbb bbe bbf bbg bbi bbn bbr bbt be- bea beb bee bef beg bei ben ber bet bfa bfb bfe bff bfg bfi bfn bfr bft bga bgb bge bgf bgg bgi bgn bgr bgt bi- bia bib bie bif big bii bin bir bit bna bnb bne bnf bng bni bnn bnr bnt bra brb bre brf brg bri brn brr brt bta btb bte btf btg bti btn btr btt eaa eab eae eaf eag eai ean ear eat eba ebb ebe ebf ebg ebi ebn ebr ebt eea eeb eee eef eeg een eer eet ef- efa efb efe eff efg efi efr eft ega egb ege egf egg egi egn egr egt eia eib eie eif eig eii ein eir eit en- ena enb ene enf eng eni enn enr ent era erb ere erf erg eri ern err ert eta etb ete etf etg eti etn etr ett faa fab fae faf fag fai fan far fat fba fbb fbe fbf fbg fbi fbn fbr fbt fea feb fee fef feg fei fen fer fet ffa ffe fff ffg ffi ffn ffr fft fga fgb fge fgf fgg fgi fgn fgr fgt fia fib fie fif fig fii fin fir fit fna fnb fne fnf fng fni fnn fnr fnt fra frb fre frf frg fri frn frr frt fta ftb fte ftf ftg fti ftn ftr ftt gaa gab gae gaf gag gai gan gar gat gba gbe gbf gbg gbi gbn gbr gbt ge- gea geb gee gef geg gei gen ger get gfa gfb gfe gff gfi gfr gft gga ggb ggg ggi ggn ggr ggt gia gib gie gif gig gii gin gir git gna gnb gne gnf gni gnn gnr gnt gra grb gre grf grg gri grn grr grt gta gtb gte gtf gtg gti gtn gtr gtt i-f ia- iaa iab iae iaf iag iai ian iar iat iba ibb ibe ibf ibg ibi ibn ibr ibt ie- iea iee ief ieg iei ien ier iet ifa ifb ife iff ifg ifi ifn ifr ift iga igb ige igf igg igi ign igr igt iia iib iie iif iii iin iir iit in- ina inb ine inf ing ini inn inr int ir- ira irb ire irf irg iri irn irr irt ita itb ite itf itg iti itn itt n-i naa nab nae naf nag nai nan nar nat nba nbb nbe nbf nbg nbi nbn nbr nbt ne- nea neb nee nef neg nei nen ner net nfa nfb nfe nff nfi nfn nfr nft nga ngb nge ngf ngg ngi ngn ngt nia nib nie nif nig nii nin nir nit nna nnb nne nnf nng nni nnn nnt nra nrb nre nrf nrg nri nrn nrr nrt nta ntb nte ntf ntg nti ntn ntr ntt ra- raa rab rae raf rag rai ran rar rat rba rbb rbe rbf rbg rbi rbn rbr rbt re- rea reb ree ref reg rei ren rer ret rfa rfb rfe rff rfg rfi rfn rfr rft rga rgb rge rgf rgg rgi rgn rgr rgt ria rib rie rif rig rii rin rir rit rna rnb rng rni rnn rnr rnt rra rrb rrf rrg rri rrn rrr rrt rta rtb rte rtf rtg rti rtn rtr rtt taa tab tae taf tag tai tan tar tat tba tbb tbe tbf tbg tbi tbn tbr tbt te- tea teb tee tef teg tei ten ter tet tfa tfb tfe tff tfg tfi tfn tfr tft tga tgb tge tgf tgg tgi tgn tgr tgt tia tib tie tif tig tii tin tir tit tna tnb tne tnf tng tni tnn tnr tnt tra trb tre trf trg tri trn trr trt tta ttb tte ttf ttg tti ttn ttr ttt