-er a-a a-b a-i aaa aab aae aaf aag aai aan aao aar ab- aba abb abe abf abg abi abn abo abr aea aeb aee aef aeg aei aen aeo aer af- afa afb afe aff afg afi afn afo afr ag- aga agb age agf agg agi agn ago agr ai- aia aib aie aif aig aii ain aio air an- ana anb ane anf ang ani ann ano anr aoa aob aoe aof aog aoi aon aoo aor ar- ara arb are arf arg ari arn aro arr baa bab bae baf bag bai ban bao bar bba bbb bbe bbf bbg bbi bbn bbo bbr be- bea beb bee bef beg bei ben beo ber bfa bfb bfe bff bfg bfi bfn bfo bfr bga bgb bge bgf bgg bgi bgn bgo bgr bi- bia bib bie bif big bii bin bio bir bna bnb bne bnf bng bni bnn bno bnr boa bob boe bof bog boi bon boo bor bra brb bre brf brg bri brn bro brr eaa eab eae eaf eag eai ean eao ear eba ebb ebe ebf ebg ebi ebn ebo ebr eea eeb eee eef eeg een eeo eer ef- efa efb efe eff efg efi efo efr ega egb ege egf egg egi egn ego egr eia eib eie eif eig eii ein eio eir en- ena enb ene enf eng eni enn eno enr eo- eoa eob eoe eof eog eoi eon eoo eor era erb ere erf erg eri ern ero err faa fab fae faf fag fai fan fao far fba fbb fbe fbf fbg fbi fbn fbo fbr fea feb fee fef feg fei fen feo fer ffa ffe fff ffg ffi ffn ffo ffr fga fgb fge fgf fgg fgi fgn fgr fia fib fie fif fig fii fin fir fna fnb fne fnf fng fni fnn fnr foa fob foe fof fog foi fon foo for fra frb fre frf frg fri frn fro frr gaa gab gae gaf gag gai gan gao gar gba gbe gbf gbg gbi gbn gbo gbr ge- gea geb gee gef geg gei gen geo ger gfa gfb gfe gff gfi gfo gfr gga ggb ggg ggi ggn ggo ggr gia gib gie gif gig gii gin gio gir gna gnb gne gnf gni gnn gno gnr goa gob goe gof gog goi gon goo gor gra grb gre grf grg gri grn gro grr i-f ia- iaa iab iae iaf iag iai ian iao iar iba ibb ibe ibf ibg ibi ibn ibo ibr ie- iea iee ief ieg iei ien ier ifa ifb ife iff ifg ifi ifn ifo ifr iga igb ige igf igg igi ign igo igr iia iib iie iif iii iin iio iir in- ina inb ine inf ing ini inn ino inr io- ioa iob ioe iof iog ioi ion ioo ior ir- ira irb ire irf irg iri irn iro irr n-i naa nab nae naf nag nai nan nao nar nba nbb nbe nbf nbg nbi nbn nbo nbr ne- nea neb nee nef neg nei nen neo ner nfa nfb nfe nff nfi nfn nfo nfr nga ngb nge ngf ngg ngi ngn ngo nia nib nie nif nig nii nin nio nir nna nnb nne nnf nng nni nnn nno no- noa nob noe nof nog noi non noo nor nra nrb nre nrf nrg nri nrn nro nrr o-i oaa oab oae oaf oag oai oan oao oar ob- oba obb obe obf obg obi obn obo obr oea oeb oee oef oeg oei oen oeo oer of- ofa ofb ofe off ofg ofi ofn ofo ofr oga oge ogf ogg ogi ogn ogo oia oib oie oif oii oin oio oir on- ona onb one onf ong oni onn ono onr oo- ooa oob oof oog ooi oon ooo oor or- ora orb ore orf org ori orn oro orr ra- raa rab rae raf rag rai ran rao rar rba rbb rbe rbf rbg rbi rbn rbo rbr re- rea reb ree ref reg rei ren reo rer rfa rfb rfe rff rfg rfi rfn rfo rfr rga rgb rge rgf rgg rgi rgn rgo rgr ria rib rie rif rig rii rin rio rir rna rnb rng rni rnn rno rnr roa rob roe rof rog roi ron roo ror rra rrb rrf rrg rri rrn rrr