-er a-a a-b a-i a-t a-z aaa aab aae aai aar aas aat aaz ab- aba abb abe abi abr abs abt abz aea aeb aee aei aer aes aet aez ai- aia aib aie aii air ais ait aiz ar- ara arb are ari arr ars art arz as- asa asb ase asi asr ass ast asz at- ata atb ate ati atr ats att atz az- aza azb aze azi azs azt azz baa bab bae bai bar bas bat baz bba bbb bbe bbi bbr bbs bbt be- bea beb bee bei ber bes bet bez bi- bia bib bie bii bir bis bit biz bra brb bre bri brr brs brt brz bsa bsb bse bsi bsr bss bst bta btb bte bti btr bts btt btz bza bze bzr bzs bzz eaa eab eae eai ear eas eat eaz eba ebb ebe ebi ebr ebs ebt eea eeb eee eer ees eet eia eib eie eii eir eis eit era erb ere eri err ers ert erz es- esa esb ese esi esr ess est eta etb ete eti etr ets ett etz eze ezr ezs ezz ia- iaa iab iae iai iar ias iat iaz iba ibb ibe ibi ibr ibs ibt ibz ie- iea iee iei ier ies iet iia iib iie iii iir iis iit ir- ira irb ire iri irr irs irt is- isa isb ise isi isr iss ist ita itb ite iti its itt itz iza ize izi izz ra- raa rab rae rai rar ras rat raz rba rbb rbe rbi rbr rbs rbt re- rea reb ree rei rer res ret rez ria rib rie rii rir ris rit riz rra rrb rri rrr rrs rrt rsa rsb rse rsi rsr rss rst rta rtb rte rti rtr rts rtt rtz rza rzb rze saa sab sae sai sar sas sat saz sba sbb sbe sbi sbr sbs sbt se- sea seb see sei ser ses set sez sia sib sie sii sir sis sit sr- sra srb sre sri srr srs srt ss- ssa ssb sse ssi ssr sss sst ssz sta stb ste sti str sts stt stz sza sze szi szr taa tab tae tai tar tas tat taz tba tbb tbe tbi tbr tbs tbt tbz te- tea teb tee tei ter tes tet tez tia tib tie tii tir tis tit tiz tra trb tre tri trr trs trt trz tsa tsb tse tsi tsr tss tst tta ttb tte tti ttr tts ttt tza tze tzs zaa zab zai zar zas zat zaz zbb zbr zbs zbt zea zeb zee zer zes zet zez zia zib zie zir zis zit ziz zrs zsa zse zsi zst zsz zta zte ztr zzr zzs zzt zzz