a-a a-b a-i a-t aaa aab aae aai aan aao aas aat ab- aba abb abe abi abn abo abs abt aea aeb aee aei aen aeo aes aet ai- aia aib aie aii ain aio ais ait an- ana anb ane ani ann ano ans ant aoa aob aoe aoi aon aoo aos aot as- asa asb ase asi asn aso ass ast at- ata atb ate ati atn ato ats att baa bab bae bai ban bao bas bat bba bbb bbe bbi bbn bbo bbs bbt be- bea beb bee bei ben beo bes bet bi- bia bib bie bii bin bio bis bit bna bnb bne bni bnn bno bns bnt boa bob boe boi bon boo bos bot bsa bsb bse bsi bsn bso bss bst bta btb bte bti btn bto bts btt eaa eab eae eai ean eao eas eat eba ebb ebe ebi ebn ebo ebs ebt eea eeb eee een eeo ees eet eia eib eie eii ein eio eis eit en- ena enb ene eni enn eno ens ent eo- eoa eob eoe eoi eon eoo eos eot es- esa esb ese esi esn eso ess est eta etb ete eti etn eto ets ett ia- iaa iab iae iai ian iao ias iat iba ibb ibe ibi ibn ibo ibs ibt ie- iea iee iei ien ies iet iia iib iie iii iin iio iis iit in- ina inb ine ini inn ino ins int io- ioa iob ioe ioi ion ioo ios iot is- isa isb ise isi isn iso iss ist ita itb ite iti itn ito its itt n-i naa nab nae nai nan nao nas nat nba nbb nbe nbi nbn nbo nbs nbt ne- nea neb nee nei nen neo nes net nia nib nie nii nin nio nis nit nna nnb nne nni nnn nno nns nnt no- noa nob noe noi non noo nos not nsa nsb nse nsi nsn nso nss nst nta ntb nte nti ntn nto nts ntt o-i oaa oab oae oai oan oao oas oat ob- oba obb obe obi obn obo obs obt oea oeb oee oei oen oeo oes oet oia oib oie oii oin oio ois oit on- ona onb one oni onn ono ons ont oo- ooa oob ooi oon ooo oos oot os- osa osb ose osi osn oso oss ost ot- ota otb ote oti otn oto ots ott saa sab sae sai san sao sas sat sba sbb sbe sbi sbn sbo sbs sbt se- sea seb see sei sen seo ses set sia sib sie sii sin sio sis sit sna snb sne sni snn sno sns snt soa sob soe soi son soo sos sot ss- ssa ssb sse ssi ssn sso sss sst sta stb ste sti stn sto sts stt taa tab tae tai tan tao tas tat tba tbb tbe tbi tbn tbo tbs tbt te- tea teb tee tei ten teo tes tet tia tib tie tii tin tio tis tit tna tnb tne tni tnn tno tns tnt to- toa tob toe toi ton too tos tot tsa tsb tse tsi tsn tso tss tst tta ttb tte tti ttn tto tts ttt