-al -ol a-a a-b a-t aaa aab aaf aak aal aao aas aat ab- aba abb abf abk abl abo abs abt af- afa afb aff afk afl afo afs aft aka akb akk akl ako aks al- ala alb alf alk all alo als alt aoa aob aof aok aol aoo aos aot as- asa asb asf ask asl aso ass ast at- ata atb atf atl ato ats att baa bab baf bak bal bao bas bat bba bbb bbf bbk bbl bbo bbs bbt bfa bfb bff bfl bfo bfs bft bka bkb bkf bkk bkl bko bks bkt bla blb blf blk bll blo bls blt boa bob bof bok bol boo bos bot bsa bsb bsf bsk bsl bso bss bst bta btb btf btk btl bto bts btt faa fab faf fak fal fao fas fat fba fbb fbf fbk fbl fbo fbs fbt ffa fff ffk ffl ffo ffs fft fka fkb fkf fkk fkl fkt fla flb flf fll flo fls flt foa fob fof fok fol foo fos fot fsa fsb fsf fsk fsl fso fss fst fta ftb ftf ftk ftl fto fts ftt k-t ka- kaa kab kaf kak kal kao kas kat kba kbb kbf kbk kbl kbo kbs kfa kff kfo kfs kkb kkk kkl kks kkt kl- kla klb klf klo kls klt koa kob kof kok kol koo kos kot ksa ksb ksf ksk ksl kso kss kst kta ktb ktf ktk ktl kto kts ktt la- laa lab laf lak lal lao las lat lba lbb lbf lbk lbl lbo lbs lbt lfa lfb lff lfk lfl lfo lfs lft lka lkb lkl lks lkt lla llb llf llk lll llo lls llt loa lob lof lok lol loo los lot lsa lsb lsf lsk lsl lso lss lst lta ltb ltf ltk ltl lto lts ltt oaa oab oaf oak oal oao oas oat ob- oba obb obf obk obl obo obs obt of- ofa ofb off ofl ofo ofs oft oka okb okk okl oko oks ola olb olf olk oll olo ols olt oo- ooa oob oof ook ool ooo oos oot os- osa osb osf osk osl oso oss ost ot- ota otb otf otk otl oto ots ott saa sab saf sak sal sao sas sat sba sbb sbf sbk sbl sbo sbs sbt sfa sfb sff sfk sfl sfo sfs sft sk- ska skb skf skk skl sko sks skt sla slb slf slk sll slo sls slt soa sob sof sok sol soo sos sot ss- ssa ssb ssf ssk ssl sso sss sst sta stb stf stk stl sto sts stt taa tab taf tak tal tao tas tat tba tbb tbf tbk tbl tbo tbs tbt tfa tfb tff tfk tfl tfo tfs tft tka tkb tkk tkl tko tks tkt tla tlf tlk tll tlo tls tlt to- toa tob tof tok tol too tos tot tsa tsb tsf tsk tsl tso tss tst tta ttb ttf ttk ttl tto tts ttt