-al a-a a-b a-c aaa aab aac aaf aah aak aal aas ab- aba abb abc abf abh abk abl abs ac- aca acb acc acf ach ack acl acs af- afa afb afc aff afh afk afl afs aha ahb ahc ahf ahh ahk ahl ahs aka akb akc akh akk akl aks al- ala alb alc alf alh alk all als as- asa asb asc asf ash ask asl ass baa bab bac baf bah bak bal bas bba bbb bbc bbf bbh bbk bbl bbs bca bcb bcc bcf bch bck bcl bcs bfa bfb bfc bff bfh bfl bfs bha bhb bhc bhf bhh bhk bhl bhs bka bkb bkc bkf bkk bkl bks bla blb blc blf blh blk bll bls bsa bsb bsc bsf bsh bsk bsl bss c-- caa cab cac caf cah cak cal cas cba cbb cbc cbf cbh cbk cbl cbs cca ccb ccc ccf cch cck ccl ccs cfa cfb cfc cff cfh cfk cfl cfs ch- cha chb chc chf chh chk chl chs cka ckb ckc ckh cks cl- cla clb clc clf clh clk cll cls csa csb csc csf csh csk csl css faa fab fac faf fah fak fal fas fba fbb fbc fbf fbh fbk fbl fbs fca fcb fcc fcf fck fcl fcs ffa ffc fff ffh ffk ffl ffs fha fhb fhc fhf fhh fhl fhs fka fkb fkc fkf fkk fkl fla flb flc flf fll fls fsa fsb fsc fsf fsh fsk fsl fss haa hab hac haf hah hak hal has hba hbb hbc hbf hbh hbk hbl hbs hca hcb hcc hcf hch hck hcl hcs hfa hfb hfc hff hfh hfk hfl hfs hha hhb hhc hhf hhh hhk hhl hhs hka hkb hkf hkh hkk hkl hks hla hlb hlc hlf hlh hll hls hsa hsb hsc hsf hsh hsk hsl hss ka- kaa kab kac kaf kah kak kal kas kba kbb kbc kbf kbh kbk kbl kbs kca kcb kcc kch kck kcl kcs kfa kfc kff kfh kfs kha khf khh khk khs kkb kkc kkh kkk kkl kks kl- kla klb klc klf klh kls ksa ksb ksc ksf ksh ksk ksl kss la- laa lab lac laf lah lak lal las lba lbb lbc lbf lbh lbk lbl lbs lca lcb lcc lcf lch lck lcl lcs lfa lfb lfc lff lfh lfk lfl lfs lha lhb lhc lhf lhh lhk lhs lka lkb lkh lkl lks lla llb llc llf llk lll lls lsa lsb lsc lsf lsh lsk lsl lss saa sab sac saf sah sak sal sas sba sbb sbc sbf sbh sbk sbl sbs sca scb scc scf sch sck scl scs sfa sfb sfc sff sfh sfk sfl sfs sh- sha shb shc shf shh shk shl shs sk- ska skb skc skf skh skk skl sks sla slb slc slf slh slk sll sls ss- ssa ssb ssc ssf ssh ssk ssl sss