-al -er a-a a-b a-c aaa aab aac aae aak aal aap aar aas ab- aba abb abc abe abk abl abp abr abs ac- aca acb acc ace ack acl acp acr acs aea aeb aec aee aek ael aep aer aes aka akb akc ake akk akl akp akr aks al- ala alb alc ale alk all alp alr als ap- apa apb apc ape apk apl app apr aps ar- ara arb arc are ark arl arp arr ars as- asa asb asc ase ask asl asp asr ass b-p baa bab bac bae bak bal bap bar bas bba bbb bbc bbe bbk bbl bbp bbr bbs bca bcb bcc bce bck bcl bcp bcr bcs be- bea beb bec bee bek bel bep ber bes bka bkb bkc bke bkk bkl bkp bkr bks bla blb blc ble blk bll blp blr bls bpa bpb bpc bpe bpl bpp bpr bps bra brb bre brk brl brp brr brs bsa bsb bsc bse bsk bsl bsp bsr bss c-- caa cab cac cae cak cal cap car cas cba cbb cbc cbe cbk cbl cbp cbr cbs cca ccb ccc cce cck ccl ccp ccr ccs ce- cea ceb cec cee cek cel cep cer ces cka ckb ckc cks cl- cla clb clc cle clk cll clp clr cls cpa cpb cpc cpe cpk cpl cpp cpr cps cra crb crc cre crk crl crp crr crs csa csb csc cse csk csl csp csr css eaa eab eac eae eak eal eap ear eas eba ebb ebc ebe ebk ebl ebp ebr ebs ec- eca ecb ecc ece eck ecl ecr ecs eea eeb eec eee eek eel eep eer ees eka ekb ekc eke ekl ekp ekr eks ela elb elc ele elk ell elp elr els ep- epa epb epc epe epl epp epr eps era erb erc ere erk erl erp err ers es- esa esb esc ese esk esl esp esr ess ka- kaa kab kac kae kak kal kap kar kas kba kbb kbc kbe kbk kbl kbp kbr kbs kca kcb kcc kce kck kcl kcp kcr kcs ke- kea keb kec kee kek kel kep ker kes kkb kkc kke kkk kkl kkp kkr kks kl- kla klb klc klr kls kpa kpc kpe kpk kpl kpp kpr kps kra krc krk krl krp krr krs ksa ksb ksc kse ksk ksl ksp ksr kss l-p la- laa lab lac lae lak lal lap lar las lba lbb lbc lbe lbk lbl lbp lbr lbs lca lcb lcc lce lck lcl lcp lcr lcs lea leb lec lee lek lel lep ler les lka lkb lkl lkp lkr lks lla llb llc lle llk lll llp llr lls lpa lpb lpc lpe lpk lpl lpp lpr lps lra lrb lrc lrk lrp lrr lrs lsa lsb lsc lse lsk lsl lsp lsr lss p-p paa pab pac pae pak pal pap par pas pba pbb pbc pbe pbk pbl pbp pbr pbs pca pcb pcc pce pck pcl pcp pcr pcs pea peb pec pee pek pel pep per pes pka pkb pkc pke pkl pkp pkr pks pla plb plc ple plk pll plp plr pls ppa ppb ppc ppe ppk ppl ppp ppr pps pra prb prc pre prk prl prp prr prs ps- psa psb psc pse psk psl psp psr pss ra- raa rab rac rae rak ral rap rar ras rba rbb rbc rbe rbk rbl rbp rbr rbs rca rcb rcc rce rcl rcp rcr rcs re- rea reb rec ree rek rel rep rer res rkb rkc rke rkk rkp rks rla rlc rle rll rlp rlr rls rpa rpb rpc rpe rpk rpl rpp rpr rps rra rrb rrc rrk rrl rrp rrr rrs rsa rsb rsc rse rsk rsl rsp rsr rss saa sab sac sae sak sal sap sar sas sba sbb sbc sbe sbk sbl sbp sbr sbs sca scb scc sce sck scl scp scr scs se- sea seb sec see sek sel sep ser ses sk- ska skb skc ske skk skl skp skr sks sla slb slc sle slk sll slp slr sls spa spb spc spe spk spl spp spr sps sr- sra srb src sre srk srl srp srr srs ss- ssa ssb ssc sse ssk ssl ssp ssr sss