a-a a-b a-i a-t aaa aab aai aan aao aap aas aat ab- aba abb abi abn abo abp abs abt ai- aia aib aii ain aio aip ais ait an- ana anb ani ann ano anp ans ant aoa aob aoi aon aoo aop aos aot ap- apa apb api apn apo app aps apt as- asa asb asi asn aso asp ass ast at- ata atb ati atn ato atp ats att b-p baa bab bai ban bao bap bas bat bba bbb bbi bbn bbo bbp bbs bbt bi- bia bib bii bin bio bip bis bit bna bnb bni bnn bno bnp bns bnt boa bob boi bon boo bop bos bot bpa bpb bpi bpn bpo bpp bps bpt bsa bsb bsi bsn bso bsp bss bst bta btb bti btn bto btp bts btt ia- iaa iab iai ian iao iap ias iat iba ibb ibi ibn ibo ibp ibs ibt iia iib iii iin iio iip iis iit in- ina inb ini inn ino inp ins int io- ioa iob ioi ion ioo iop ios iot ipa ipb ipi ipn ipo ipp ips ipt is- isa isb isi isn iso isp iss ist ita itb iti itn ito itp its itt n-i naa nab nai nan nao nap nas nat nba nbb nbi nbn nbo nbp nbs nbt nia nib nii nin nio nip nis nit nna nnb nni nnn nno nnp nns nnt no- noa nob noi non noo nop nos not npa npb npi npn npo npp nps npt nsa nsb nsi nsn nso nsp nss nst nta ntb nti ntn nto ntp nts ntt o-i oaa oab oai oan oao oap oas oat ob- oba obb obi obn obo obp obs obt oia oib oii oin oio oip ois oit on- ona onb oni onn ono onp ons ont oo- ooa oob ooi oon ooo oop oos oot op- opa opb opi opn opo opp ops opt os- osa osb osi osn oso osp oss ost ot- ota otb oti otn oto otp ots ott p-p paa pab pai pan pao pap pas pat pba pbb pbi pbn pbo pbp pbs pbt pia pib pii pin pio pip pis pit pn- pna pnb pni pnn pno pnp pns pnt poa pob poi pon poo pop pos pot ppa ppb ppi ppn ppo ppp pps ppt ps- psa psb psi psn pso psp pss pst pt- pta ptb pti ptn pto ptp pts ptt saa sab sai san sao sap sas sat sba sbb sbi sbn sbo sbp sbs sbt sia sib sii sin sio sip sis sit sna snb sni snn sno snp sns snt soa sob soi son soo sop sos sot spa spb spi spn spo spp sps spt ss- ssa ssb ssi ssn sso ssp sss sst sta stb sti stn sto stp sts stt taa tab tai tan tao tap tas tat tba tbb tbi tbn tbo tbp tbs tbt tia tib tii tin tio tip tis tit tna tnb tni tnn tno tnp tns tnt to- toa tob toi ton too top tos tot tpa tpb tpi tpn tpo tpp tps tpt tsa tsb tsi tsn tso tsp tss tst tta ttb tti ttn tto ttp tts ttt