-al a-a a-b a-c aaa aab aac aae aak aal aap aas ab- aba abb abc abe abk abl abp abs ac- aca acb acc ace ack acl acp acs aea aeb aec aee aek ael aep aes aka akb akc ake akk akl akp aks al- ala alb alc ale alk all alp als ap- apa apb apc ape apk apl app aps as- asa asb asc ase ask asl asp ass b-p baa bab bac bae bak bal bap bas bba bbb bbc bbe bbk bbl bbp bbs bca bcb bcc bce bck bcl bcp bcs be- bea beb bec bee bek bel bep bes bka bkb bkc bke bkk bkl bkp bks bla blb blc ble blk bll blp bls bpa bpb bpc bpe bpl bpp bps bsa bsb bsc bse bsk bsl bsp bss c-- caa cab cac cae cak cal cap cas cba cbb cbc cbe cbk cbl cbp cbs cca ccb ccc cce cck ccl ccp ccs ce- cea ceb cec cee cek cel cep ces cka ckb ckc cks cl- cla clb clc cle clk cll clp cls cpa cpb cpc cpe cpk cpl cpp cps csa csb csc cse csk csl csp css eaa eab eac eae eak eal eap eas eba ebb ebc ebe ebk ebl ebp ebs ec- eca ecb ecc ece eck ecl ecs eea eeb eec eee eek eel eep ees eka ekb ekc eke ekl ekp eks ela elb elc ele elk ell elp els ep- epa epb epc epe epl epp eps es- esa esb esc ese esk esl esp ess ka- kaa kab kac kae kak kal kap kas kba kbb kbc kbe kbk kbl kbp kbs kca kcb kcc kce kck kcl kcp kcs ke- kea keb kec kee kek kel kep kes kkb kkc kke kkk kkl kkp kks kl- kla klb klc kls kpa kpc kpe kpk kpl kpp kps ksa ksb ksc kse ksk ksl ksp kss l-p la- laa lab lac lae lak lal lap las lba lbb lbc lbe lbk lbl lbp lbs lca lcb lcc lce lck lcl lcp lcs lea leb lec lee lek lel lep les lka lkb lkl lkp lks lla llb llc lle llk lll llp lls lpa lpb lpc lpe lpk lpl lpp lps lsa lsb lsc lse lsk lsl lsp lss p-p paa pab pac pae pak pal pap pas pba pbb pbc pbe pbk pbl pbp pbs pca pcb pcc pce pck pcl pcp pcs pea peb pec pee pek pel pep pes pka pkb pkc pke pkl pkp pks pla plb plc ple plk pll plp pls ppa ppb ppc ppe ppk ppl ppp pps ps- psa psb psc pse psk psl psp pss saa sab sac sae sak sal sap sas sba sbb sbc sbe sbk sbl sbp sbs sca scb scc sce sck scl scp scs se- sea seb sec see sek sel sep ses sk- ska skb skc ske skk skl skp sks sla slb slc sle slk sll slp sls spa spb spc spe spk spl spp sps ss- ssa ssb ssc sse ssk ssl ssp sss