-al -ol a-a a-b a-c a-t aaa aab aac aaf aak aal aao aas aat ab- aba abb abc abf abk abl abo abs abt ac- aca acb acc acf ack acl aco acs act af- afa afb afc aff afk afl afo afs aft aka akb akc akk akl ako aks al- ala alb alc alf alk all alo als alt aoa aob aoc aof aok aol aoo aos aot as- asa asb asc asf ask asl aso ass ast at- ata atb atc atf atl ato ats att baa bab bac baf bak bal bao bas bat bba bbb bbc bbf bbk bbl bbo bbs bbt bca bcb bcc bcf bck bcl bco bcs bct bfa bfb bfc bff bfl bfo bfs bft bka bkb bkc bkf bkk bkl bko bks bkt bla blb blc blf blk bll blo bls blt boa bob boc bof bok bol boo bos bot bsa bsb bsc bsf bsk bsl bso bss bst bta btb btc btf btk btl bto bts btt c-- caa cab cac caf cak cal cao cas cat cba cbb cbc cbf cbk cbl cbo cbs cbt cca ccb ccc ccf cck ccl cco ccs cct cfa cfb cfc cff cfk cfl cfo cfs cft cka ckb ckc cko cks ckt cl- cla clb clc clf clk cll clo cls clt co- coa cob coc cof cok col coo cos cot csa csb csc csf csk csl cso css cst cta ctb ctc ctf ctk ctl cto cts ctt faa fab fac faf fak fal fao fas fat fba fbb fbc fbf fbk fbl fbo fbs fbt fca fcb fcc fcf fck fcl fco fcs fct ffa ffc fff ffk ffl ffo ffs fft fka fkb fkc fkf fkk fkl fkt fla flb flc flf fll flo fls flt foa fob foc fof fok fol foo fos fot fsa fsb fsc fsf fsk fsl fso fss fst fta ftb ftc ftf ftk ftl fto fts ftt k-t ka- kaa kab kac kaf kak kal kao kas kat kba kbb kbc kbf kbk kbl kbo kbs kca kcb kcc kck kcl kcs kct kfa kfc kff kfo kfs kkb kkc kkk kkl kks kkt kl- kla klb klc klf klo kls klt koa kob koc kof kok kol koo kos kot ksa ksb ksc ksf ksk ksl kso kss kst kta ktb ktc ktf ktk ktl kto kts ktt la- laa lab lac laf lak lal lao las lat lba lbb lbc lbf lbk lbl lbo lbs lbt lca lcb lcc lcf lck lcl lco lcs lct lfa lfb lfc lff lfk lfl lfo lfs lft lka lkb lkl lks lkt lla llb llc llf llk lll llo lls llt loa lob loc lof lok lol loo los lot lsa lsb lsc lsf lsk lsl lso lss lst lta ltb ltc ltf ltk ltl lto lts ltt oaa oab oac oaf oak oal oao oas oat ob- oba obb obc obf obk obl obo obs obt oc- oca ocb occ ocf ock ocl oco ocs oct of- ofa ofb ofc off ofl ofo ofs oft oka okb okc okk okl oko oks ola olb olc olf olk oll olo ols olt oo- ooa oob ooc oof ook ool ooo oos oot os- osa osb osc osf osk osl oso oss ost ot- ota otb otc otf otk otl oto ots ott saa sab sac saf sak sal sao sas sat sba sbb sbc sbf sbk sbl sbo sbs sbt sca scb scc scf sck scl sco scs sct sfa sfb sfc sff sfk sfl sfo sfs sft sk- ska skb skc skf skk skl sko sks skt sla slb slc slf slk sll slo sls slt soa sob soc sof sok sol soo sos sot ss- ssa ssb ssc ssf ssk ssl sso sss sst sta stb stc stf stk stl sto sts stt taa tab tac taf tak tal tao tas tat tba tbb tbc tbf tbk tbl tbo tbs tbt tca tcb tcc tcf tck tcl tco tcs tct tfa tfb tfc tff tfk tfl tfo tfs tft tka tkb tkc tkk tkl tko tks tkt tla tlc tlf tlk tll tlo tls tlt to- toa tob toc tof tok tol too tos tot tsa tsb tsc tsf tsk tsl tso tss tst tta ttb ttc ttf ttk ttl tto tts ttt