a-a a-b a-i a-t aaa aab aai aan aao aap aar aas aat ab- aba abb abi abn abo abp abr abs abt ai- aia aib aii ain aio aip air ais ait an- ana anb ani ann ano anp anr ans ant aoa aob aoi aon aoo aop aor aos aot ap- apa apb api apn apo app apr aps apt ar- ara arb ari arn aro arp arr ars art as- asa asb asi asn aso asp asr ass ast at- ata atb ati atn ato atp atr ats att b-p baa bab bai ban bao bap bar bas bat bba bbb bbi bbn bbo bbp bbr bbs bbt bi- bia bib bii bin bio bip bir bis bit bna bnb bni bnn bno bnp bnr bns bnt boa bob boi bon boo bop bor bos bot bpa bpb bpi bpn bpo bpp bpr bps bpt bra brb bri brn bro brp brr brs brt bsa bsb bsi bsn bso bsp bsr bss bst bta btb bti btn bto btp btr bts btt ia- iaa iab iai ian iao iap iar ias iat iba ibb ibi ibn ibo ibp ibr ibs ibt iia iib iii iin iio iip iir iis iit in- ina inb ini inn ino inp inr ins int io- ioa iob ioi ion ioo iop ior ios iot ipa ipb ipi ipn ipo ipp ipr ips ipt ir- ira irb iri irn iro irp irr irs irt is- isa isb isi isn iso isp isr iss ist ita itb iti itn ito itp its itt n-i naa nab nai nan nao nap nar nas nat nba nbb nbi nbn nbo nbp nbr nbs nbt nia nib nii nin nio nip nir nis nit nna nnb nni nnn nno nnp nns nnt no- noa nob noi non noo nop nor nos not npa npb npi npn npo npp npr nps npt nra nrb nri nrn nro nrp nrr nrs nrt nsa nsb nsi nsn nso nsp nsr nss nst nta ntb nti ntn nto ntp ntr nts ntt o-i oaa oab oai oan oao oap oar oas oat ob- oba obb obi obn obo obp obr obs obt oia oib oii oin oio oip oir ois oit on- ona onb oni onn ono onp onr ons ont oo- ooa oob ooi oon ooo oop oor oos oot op- opa opb opi opn opo opp opr ops opt or- ora orb ori orn oro orp orr ors ort os- osa osb osi osn oso osp osr oss ost ot- ota otb oti otn oto otp otr ots ott p-p paa pab pai pan pao pap par pas pat pba pbb pbi pbn pbo pbp pbr pbs pbt pia pib pii pin pio pip pir pis pit pn- pna pnb pni pnn pno pnp pnr pns pnt poa pob poi pon poo pop por pos pot ppa ppb ppi ppn ppo ppp ppr pps ppt pra prb pri prn pro prp prr prs prt ps- psa psb psi psn pso psp psr pss pst pt- pta ptb pti ptn pto ptp ptr pts ptt ra- raa rab rai ran rao rap rar ras rat rba rbb rbi rbn rbo rbp rbr rbs rbt ria rib rii rin rio rip rir ris rit rna rnb rni rnn rno rnp rnr rns rnt roa rob roi ron roo rop ror ros rot rpa rpb rpi rpn rpo rpp rpr rps rpt rra rrb rri rrn rrp rrr rrs rrt rsa rsb rsi rsn rso rsp rsr rss rst rta rtb rti rtn rto rtp rtr rts rtt saa sab sai san sao sap sar sas sat sba sbb sbi sbn sbo sbp sbr sbs sbt sia sib sii sin sio sip sir sis sit sna snb sni snn sno snp snr sns snt soa sob soi son soo sop sor sos sot spa spb spi spn spo spp spr sps spt sr- sra srb sri srn sro srp srr srs srt ss- ssa ssb ssi ssn sso ssp ssr sss sst sta stb sti stn sto stp str sts stt taa tab tai tan tao tap tar tas tat tba tbb tbi tbn tbo tbp tbr tbs tbt tia tib tii tin tio tip tir tis tit tna tnb tni tnn tno tnp tnr tns tnt to- toa tob toi ton too top tor tos tot tpa tpb tpi tpn tpo tpp tpr tps tpt tra trb tri trn tro trp trr trs trt tsa tsb tsi tsn tso tsp tsr tss tst tta ttb tti ttn tto ttp ttr tts ttt