-er -ic a-a a-b a-c a-i a-t aaa aab aac aae aai aan aar aas aat ab- aba abb abc abe abi abn abr abs abt ac- aca acb acc ace aci acn acr acs act aea aeb aec aee aei aen aer aes aet ai- aia aib aic aie aii ain air ais ait an- ana anb anc ane ani ann anr ans ant ar- ara arb arc are ari arn arr ars art as- asa asb asc ase asi asn asr ass ast at- ata atb atc ate ati atn atr ats att baa bab bac bae bai ban bar bas bat bba bbb bbc bbe bbi bbn bbr bbs bbt bca bcb bcc bce bci bcn bcr bcs bct be- bea beb bec bee bei ben ber bes bet bi- bia bib bic bie bii bin bir bis bit bna bnb bnc bne bni bnn bnr bns bnt bra brb bre bri brn brr brs brt bsa bsb bsc bse bsi bsn bsr bss bst bta btb btc bte bti btn btr bts btt c-- caa cab cac cae cai can car cas cat cba cbb cbc cbe cbi cbn cbr cbs cbt cca ccb ccc cce cci ccn ccr ccs cct ce- cea ceb cec cee cei cen cer ces cet ci- cia cib cic cie cii cin cir cis cit cn- cna cnb cnc cne cni cnn cnr cns cnt cra crb crc cre cri crn crr crs crt csa csb csc cse csi csn csr css cst cta ctb ctc cte cti ctn ctr cts ctt eaa eab eac eae eai ean ear eas eat eba ebb ebc ebe ebi ebn ebr ebs ebt ec- eca ecb ecc ece eci ecn ecr ecs ect eea eeb eec eee een eer ees eet eia eib eic eie eii ein eir eis eit en- ena enb enc ene eni enn enr ens ent era erb erc ere eri ern err ers ert es- esa esb esc ese esi esn esr ess est eta etb etc ete eti etn etr ets ett ia- iaa iab iac iae iai ian iar ias iat iba ibb ibc ibe ibi ibn ibr ibs ibt ica icb icc ice ici icn icr ics ict ie- iea iec iee iei ien ier ies iet iia iib iic iie iii iin iir iis iit in- ina inb inc ine ini inn inr ins int ir- ira irb irc ire iri irn irr irs irt is- isa isb isc ise isi isn isr iss ist ita itb itc ite iti itn its itt n-i naa nab nac nae nai nan nar nas nat nba nbb nbc nbe nbi nbn nbr nbs nbt nca ncb ncc nce nci ncn ncr ncs nct ne- nea neb nec nee nei nen ner nes net nia nib nic nie nii nin nir nis nit nna nnb nnc nne nni nnn nns nnt nra nrb nrc nre nri nrn nrr nrs nrt nsa nsb nsc nse nsi nsn nsr nss nst nta ntb ntc nte nti ntn ntr nts ntt ra- raa rab rac rae rai ran rar ras rat rba rbb rbc rbe rbi rbn rbr rbs rbt rca rcb rcc rce rci rcn rcr rcs rct re- rea reb rec ree rei ren rer res ret ria rib ric rie rii rin rir ris rit rna rnb rnc rni rnn rnr rns rnt rra rrb rrc rri rrn rrr rrs rrt rsa rsb rsc rse rsi rsn rsr rss rst rta rtb rtc rte rti rtn rtr rts rtt saa sab sac sae sai san sar sas sat sba sbb sbc sbe sbi sbn sbr sbs sbt sca scb scc sce sci scn scr scs sct se- sea seb sec see sei sen ser ses set sia sib sic sie sii sin sir sis sit sna snb snc sne sni snn snr sns snt sr- sra srb src sre sri srn srr srs srt ss- ssa ssb ssc sse ssi ssn ssr sss sst sta stb stc ste sti stn str sts stt taa tab tac tae tai tan tar tas tat tba tbb tbc tbe tbi tbn tbr tbs tbt tca tcb tcc tce tci tcn tcr tcs tct te- tea teb tec tee tei ten ter tes tet tia tib tic tie tii tin tir tis tit tna tnb tnc tne tni tnn tnr tns tnt tra trb trc tre tri trn trr trs trt tsa tsb tsc tse tsi tsn tsr tss tst tta ttb ttc tte tti ttn ttr tts ttt