a-a a-b a-i a-t aaa aab aae aai aao aap aas aat ab- aba abb abe abi abo abp abs abt aea aeb aee aei aeo aep aes aet ai- aia aib aie aii aio aip ais ait aoa aob aoe aoi aoo aop aos aot ap- apa apb ape api apo app aps apt as- asa asb ase asi aso asp ass ast at- ata atb ate ati ato atp ats att b-p baa bab bae bai bao bap bas bat bba bbb bbe bbi bbo bbp bbs bbt be- bea beb bee bei beo bep bes bet bi- bia bib bie bii bio bip bis bit boa bob boe boi boo bop bos bot bpa bpb bpe bpi bpo bpp bps bpt bsa bsb bse bsi bso bsp bss bst bta btb bte bti bto btp bts btt eaa eab eae eai eao eap eas eat eba ebb ebe ebi ebo ebp ebs ebt eea eeb eee eeo eep ees eet eia eib eie eii eio eip eis eit eo- eoa eob eoe eoi eoo eop eos eot ep- epa epb epe epi epo epp eps ept es- esa esb ese esi eso esp ess est eta etb ete eti eto etp ets ett ia- iaa iab iae iai iao iap ias iat iba ibb ibe ibi ibo ibp ibs ibt ie- iea iee iei iep ies iet iia iib iie iii iio iip iis iit io- ioa iob ioe ioi ioo iop ios iot ipa ipb ipe ipi ipo ipp ips ipt is- isa isb ise isi iso isp iss ist ita itb ite iti ito itp its itt o-i oaa oab oae oai oao oap oas oat ob- oba obb obe obi obo obp obs obt oea oeb oee oei oeo oep oes oet oia oib oie oii oio oip ois oit oo- ooa oob ooi ooo oop oos oot op- opa opb ope opi opo opp ops opt os- osa osb ose osi oso osp oss ost ot- ota otb ote oti oto otp ots ott p-p paa pab pae pai pao pap pas pat pba pbb pbe pbi pbo pbp pbs pbt pea peb pee pei peo pep pes pet pia pib pie pii pio pip pis pit poa pob poe poi poo pop pos pot ppa ppb ppe ppi ppo ppp pps ppt ps- psa psb pse psi pso psp pss pst pt- pta ptb pte pti pto ptp pts ptt saa sab sae sai sao sap sas sat sba sbb sbe sbi sbo sbp sbs sbt se- sea seb see sei seo sep ses set sia sib sie sii sio sip sis sit soa sob soe soi soo sop sos sot spa spb spe spi spo spp sps spt ss- ssa ssb sse ssi sso ssp sss sst sta stb ste sti sto stp sts stt taa tab tae tai tao tap tas tat tba tbb tbe tbi tbo tbp tbs tbt te- tea teb tee tei teo tep tes tet tia tib tie tii tio tip tis tit to- toa tob toe toi too top tos tot tpa tpb tpe tpi tpo tpp tps tpt tsa tsb tse tsi tso tsp tss tst tta ttb tte tti tto ttp tts ttt