-al -er a-a a-b a-i aaa aab aae aaf aag aai aal aar aas ab- aba abb abe abf abg abi abl abr abs aea aeb aee aef aeg aei ael aer aes af- afa afb afe aff afg afi afl afr afs ag- aga agb age agf agg agi agl agr ags ai- aia aib aie aif aig aii ail air ais al- ala alb ale alf alg ali all alr als ar- ara arb are arf arg ari arl arr ars as- asa asb ase asf asg asi asl asr ass baa bab bae baf bag bai bal bar bas bba bbb bbe bbf bbg bbi bbl bbr bbs be- bea beb bee bef beg bei bel ber bes bfa bfb bfe bff bfg bfi bfl bfr bfs bga bgb bge bgf bgg bgi bgl bgr bgs bi- bia bib bie bif big bii bil bir bis bla blb ble blf blg bli bll blr bls bra brb bre brf brg bri brl brr brs bsa bsb bse bsf bsg bsi bsl bsr bss eaa eab eae eaf eag eai eal ear eas eba ebb ebe ebf ebg ebi ebl ebr ebs eea eeb eee eef eeg eel eer ees ef- efa efb efe eff efg efi efl efr efs ega egb ege egf egg egi egl egr egs eia eib eie eif eig eii eil eir eis ela elb ele elf elg eli ell elr els era erb ere erf erg eri erl err ers es- esa esb ese esf esg esi esl esr ess faa fab fae faf fag fai fal far fas fba fbb fbe fbf fbg fbi fbl fbr fbs fea feb fee fef feg fei fel fer fes ffa ffe fff ffg ffi ffl ffr ffs fga fgb fge fgf fgg fgi fgl fgr fgs fia fib fie fif fig fii fil fir fis fla flb fle flf flg fli fll flr fls fra frb fre frf frg fri frl frr frs fsa fsb fse fsf fsg fsi fsl fsr fss gaa gab gae gaf gag gai gal gar gas gba gbe gbf gbg gbi gbl gbr gbs ge- gea geb gee gef geg gei gel ger ges gfa gfb gfe gff gfi gfl gfr gfs gga ggb ggg ggi ggr ggs gia gib gie gif gig gii gil gir gis gla glb gle glf glg gli gll glr gls gra grb gre grf grg gri grl grr grs gsa gsb gse gsf gsg gsi gsl gsr gss i-f ia- iaa iab iae iaf iag iai ial iar ias iba ibb ibe ibf ibg ibi ibl ibr ibs ie- iea iee ief ieg iei iel ier ies ifa ifb ife iff ifg ifi ifl ifr ifs iga igb ige igf igg igi igl igr igs iia iib iie iif iii iil iir iis il- ila ilb ile ilf ilg ili ill ilr ils ir- ira irb ire irf irg iri irl irr irs is- isa isb ise isf isg isi isl isr iss la- laa lab lae laf lag lai lal lar las lba lbb lbe lbf lbg lbi lbl lbr lbs lea leb lee lef leg lei lel ler les lfa lfb lfe lff lfg lfi lfl lfr lfs lga lgb lge lgf lgg lgi lgl lgr lgs lia lib lie lif lig lii lil lir lis lla llb lle llf llg lli lll llr lls lra lrb lrf lrg lri lrr lrs lsa lsb lse lsf lsg lsi lsl lsr lss ra- raa rab rae raf rag rai ral rar ras rba rbb rbe rbf rbg rbi rbl rbr rbs re- rea reb ree ref reg rei rel rer res rfa rfb rfe rff rfg rfi rfl rfr rfs rga rgb rge rgf rgg rgi rgr rgs ria rib rie rif rig rii ril rir ris rla rle rlf rlg rli rll rlr rls rra rrb rrf rrg rri rrl rrr rrs rsa rsb rse rsf rsg rsi rsl rsr rss saa sab sae saf sag sai sal sar sas sba sbb sbe sbf sbg sbi sbl sbr sbs se- sea seb see sef seg sei sel ser ses sfa sfb sfe sff sfg sfi sfl sfr sfs sga sgb sge sgf sgg sgi sgl sgr sgs sia sib sie sif sig sii sil sir sis sla slb sle slf slg sli sll slr sls sr- sra srb sre srf srg sri srl srr srs ss- ssa ssb sse ssf ssg ssi ssl ssr sss