-er -ic a-a a-b a-c a-i aaa aab aac aae aai aan aar aas ab- aba abb abc abe abi abn abr abs ac- aca acb acc ace aci acn acr acs aea aeb aec aee aei aen aer aes ai- aia aib aic aie aii ain air ais an- ana anb anc ane ani ann anr ans ar- ara arb arc are ari arn arr ars as- asa asb asc ase asi asn asr ass baa bab bac bae bai ban bar bas bba bbb bbc bbe bbi bbn bbr bbs bca bcb bcc bce bci bcn bcr bcs be- bea beb bec bee bei ben ber bes bi- bia bib bic bie bii bin bir bis bna bnb bnc bne bni bnn bnr bns bra brb bre bri brn brr brs bsa bsb bsc bse bsi bsn bsr bss c-- caa cab cac cae cai can car cas cba cbb cbc cbe cbi cbn cbr cbs cca ccb ccc cce cci ccn ccr ccs ce- cea ceb cec cee cei cen cer ces ci- cia cib cic cie cii cin cir cis cn- cna cnb cnc cne cni cnn cnr cns cra crb crc cre cri crn crr crs csa csb csc cse csi csn csr css eaa eab eac eae eai ean ear eas eba ebb ebc ebe ebi ebn ebr ebs ec- eca ecb ecc ece eci ecn ecr ecs eea eeb eec eee een eer ees eia eib eic eie eii ein eir eis en- ena enb enc ene eni enn enr ens era erb erc ere eri ern err ers es- esa esb esc ese esi esn esr ess ia- iaa iab iac iae iai ian iar ias iba ibb ibc ibe ibi ibn ibr ibs ica icb icc ice ici icn icr ics ie- iea iec iee iei ien ier ies iia iib iic iie iii iin iir iis in- ina inb inc ine ini inn inr ins ir- ira irb irc ire iri irn irr irs is- isa isb isc ise isi isn isr iss n-i naa nab nac nae nai nan nar nas nba nbb nbc nbe nbi nbn nbr nbs nca ncb ncc nce nci ncn ncr ncs ne- nea neb nec nee nei nen ner nes nia nib nic nie nii nin nir nis nna nnb nnc nne nni nnn nns nra nrb nrc nre nri nrn nrr nrs nsa nsb nsc nse nsi nsn nsr nss ra- raa rab rac rae rai ran rar ras rba rbb rbc rbe rbi rbn rbr rbs rca rcb rcc rce rci rcn rcr rcs re- rea reb rec ree rei ren rer res ria rib ric rie rii rin rir ris rna rnb rnc rni rnn rnr rns rra rrb rrc rri rrn rrr rrs rsa rsb rsc rse rsi rsn rsr rss saa sab sac sae sai san sar sas sba sbb sbc sbe sbi sbn sbr sbs sca scb scc sce sci scn scr scs se- sea seb sec see sei sen ser ses sia sib sic sie sii sin sir sis sna snb snc sne sni snn snr sns sr- sra srb src sre sri srn srr srs ss- ssa ssb ssc sse ssi ssn ssr sss