-al -er a-a a-b a-c aaa aab aac aae aal aap aar aas ab- aba abb abc abe abl abp abr abs ac- aca acb acc ace acl acp acr acs aea aeb aec aee ael aep aer aes al- ala alb alc ale all alp alr als ap- apa apb apc ape apl app apr aps ar- ara arb arc are arl arp arr ars as- asa asb asc ase asl asp asr ass b-p baa bab bac bae bal bap bar bas bba bbb bbc bbe bbl bbp bbr bbs bca bcb bcc bce bcl bcp bcr bcs be- bea beb bec bee bel bep ber bes bla blb blc ble bll blp blr bls bpa bpb bpc bpe bpl bpp bpr bps bra brb bre brl brp brr brs bsa bsb bsc bse bsl bsp bsr bss c-- caa cab cac cae cal cap car cas cba cbb cbc cbe cbl cbp cbr cbs cca ccb ccc cce ccl ccp ccr ccs ce- cea ceb cec cee cel cep cer ces cl- cla clb clc cle cll clp clr cls cpa cpb cpc cpe cpl cpp cpr cps cra crb crc cre crl crp crr crs csa csb csc cse csl csp csr css eaa eab eac eae eal eap ear eas eba ebb ebc ebe ebl ebp ebr ebs ec- eca ecb ecc ece ecl ecr ecs eea eeb eec eee eel eep eer ees ela elb elc ele ell elp elr els ep- epa epb epc epe epl epp epr eps era erb erc ere erl erp err ers es- esa esb esc ese esl esp esr ess l-p la- laa lab lac lae lal lap lar las lba lbb lbc lbe lbl lbp lbr lbs lca lcb lcc lce lcl lcp lcr lcs lea leb lec lee lel lep ler les lla llb llc lle lll llp llr lls lpa lpb lpc lpe lpl lpp lpr lps lra lrb lrc lrp lrr lrs lsa lsb lsc lse lsl lsp lsr lss p-p paa pab pac pae pal pap par pas pba pbb pbc pbe pbl pbp pbr pbs pca pcb pcc pce pcl pcp pcr pcs pea peb pec pee pel pep per pes pla plb plc ple pll plp plr pls ppa ppb ppc ppe ppl ppp ppr pps pra prb prc pre prl prp prr prs ps- psa psb psc pse psl psp psr pss ra- raa rab rac rae ral rap rar ras rba rbb rbc rbe rbl rbp rbr rbs rca rcb rcc rce rcl rcp rcr rcs re- rea reb rec ree rel rep rer res rla rlc rle rll rlp rlr rls rpa rpb rpc rpe rpl rpp rpr rps rra rrb rrc rrl rrp rrr rrs rsa rsb rsc rse rsl rsp rsr rss saa sab sac sae sal sap sar sas sba sbb sbc sbe sbl sbp sbr sbs sca scb scc sce scl scp scr scs se- sea seb sec see sel sep ser ses sla slb slc sle sll slp slr sls spa spb spc spe spl spp spr sps sr- sra srb src sre srl srp srr srs ss- ssa ssb ssc sse ssl ssp ssr sss