-al a-a a-b aaa aab aae aaf aag aal aas ab- aba abb abe abf abg abl abs aea aeb aee aef aeg ael aes af- afa afb afe aff afg afl afs ag- aga agb age agf agg agl ags al- ala alb ale alf alg all als as- asa asb ase asf asg asl ass baa bab bae baf bag bal bas bba bbb bbe bbf bbg bbl bbs be- bea beb bee bef beg bel bes bfa bfb bfe bff bfg bfl bfs bga bgb bge bgf bgg bgl bgs bla blb ble blf blg bll bls bsa bsb bse bsf bsg bsl bss eaa eab eae eaf eag eal eas eba ebb ebe ebf ebg ebl ebs eea eeb eee eef eeg eel ees ef- efa efb efe eff efg efl efs ega egb ege egf egg egl egs ela elb ele elf elg ell els es- esa esb ese esf esg esl ess faa fab fae faf fag fal fas fba fbb fbe fbf fbg fbl fbs fea feb fee fef feg fel fes ffa ffe fff ffg ffl ffs fga fgb fge fgf fgg fgl fgs fla flb fle flf flg fll fls fsa fsb fse fsf fsg fsl fss gaa gab gae gaf gag gal gas gba gbe gbf gbg gbl gbs ge- gea geb gee gef geg gel ges gfa gfb gfe gff gfl gfs gga ggb ggg ggs gla glb gle glf glg gll gls gsa gsb gse gsf gsg gsl gss la- laa lab lae laf lag lal las lba lbb lbe lbf lbg lbl lbs lea leb lee lef leg lel les lfa lfb lfe lff lfg lfl lfs lga lgb lge lgf lgg lgl lgs lla llb lle llf llg lll lls lsa lsb lse lsf lsg lsl lss saa sab sae saf sag sal sas sba sbb sbe sbf sbg sbl sbs se- sea seb see sef seg sel ses sfa sfb sfe sff sfg sfl sfs sga sgb sge sgf sgg sgl sgs sla slb sle slf slg sll sls ss- ssa ssb sse ssf ssg ssl sss