-er a-a a-b a-c aaa aab aac aae aah aan aar aas ab- aba abb abc abe abh abn abr abs ac- aca acb acc ace ach acn acr acs aea aeb aec aee aeh aen aer aes aha ahb ahc ahe ahh ahn ahr ahs an- ana anb anc ane anh ann anr ans ar- ara arb arc are arh arn arr ars as- asa asb asc ase ash asn asr ass baa bab bac bae bah ban bar bas bba bbb bbc bbe bbh bbn bbr bbs bca bcb bcc bce bch bcn bcr bcs be- bea beb bec bee beh ben ber bes bha bhb bhc bhe bhh bhr bhs bna bnb bnc bne bnn bnr bns bra brb bre brh brn brr brs bsa bsb bsc bse bsh bsn bsr bss c-- caa cab cac cae cah can car cas cba cbb cbc cbe cbh cbn cbr cbs cca ccb ccc cce cch ccn ccr ccs ce- cea ceb cec cee ceh cen cer ces ch- cha chb chc che chh chn chr chs cn- cna cnb cnc cne cnh cnn cnr cns cra crb crc cre crh crn crr crs csa csb csc cse csh csn csr css eaa eab eac eae eah ean ear eas eba ebb ebc ebe ebh ebn ebr ebs ec- eca ecb ecc ece ech ecn ecr ecs eea eeb eec eee een eer ees eha ehb ehc ehe ehh ehn ehr ehs en- ena enb enc ene enh enn enr ens era erb erc ere erh ern err ers es- esa esb esc ese esh esn esr ess haa hab hac hae hah han har has hba hbb hbc hbe hbh hbn hbr hbs hca hcb hcc hce hch hcn hcr hcs he- hea heb hec hee heh hen her hes hha hhb hhc hhe hhh hhn hhr hhs hna hnb hnc hne hnh hnn hns hr- hra hrb hrc hre hrh hrn hrr hrs hsa hsb hsc hse hsh hsn hsr hss naa nab nac nae nah nan nar nas nba nbb nbc nbe nbn nbr nbs nca ncb ncc nce nch ncn ncr ncs ne- nea neb nec nee neh nen ner nes nha nhb nhc nhe nhh nhn nhr nhs nna nnb nnc nne nnh nnn nns nra nrb nrc nre nrn nrr nrs nsa nsb nsc nse nsh nsn nsr nss ra- raa rab rac rae rah ran rar ras rba rbb rbc rbe rbh rbn rbr rbs rca rcb rcc rce rch rcn rcr rcs re- rea reb rec ree reh ren rer res rh- rha rhb rhc rhe rhh rhn rhr rhs rna rnb rnc rnh rnn rnr rns rra rrb rrc rrh rrn rrr rrs rsa rsb rsc rse rsh rsn rsr rss saa sab sac sae sah san sar sas sba sbb sbc sbe sbh sbn sbr sbs sca scb scc sce sch scn scr scs se- sea seb sec see seh sen ser ses sh- sha shb shc she shh shn shr shs sna snb snc sne snn snr sns sr- sra srb src sre srh srn srr srs ss- ssa ssb ssc sse ssh ssn ssr sss