a-a a-b a-i a-t aaa aab aai aan aao aap aar aat ab- aba abb abi abn abo abp abr abt ai- aia aib aii ain aio aip air ait an- ana anb ani ann ano anp anr ant aoa aob aoi aon aoo aop aor aot ap- apa apb api apn apo app apr apt ar- ara arb ari arn aro arp arr art at- ata atb ati atn ato atp atr att b-p baa bab bai ban bao bap bar bat bba bbb bbi bbn bbo bbp bbr bbt bi- bia bib bii bin bio bip bir bit bna bnb bni bnn bno bnp bnr bnt boa bob boi bon boo bop bor bot bpa bpb bpi bpn bpo bpp bpr bpt bra brb bri brn bro brp brr brt bta btb bti btn bto btp btr btt ia- iaa iab iai ian iao iap iar iat iba ibb ibi ibn ibo ibp ibr ibt iia iib iii iin iio iip iir iit in- ina inb ini inn ino inp inr int io- ioa iob ioi ion ioo iop ior iot ipa ipb ipi ipn ipo ipp ipr ipt ir- ira irb iri irn iro irp irr irt ita itb iti itn ito itp itt n-i naa nab nai nan nao nap nar nat nba nbb nbi nbn nbo nbp nbr nbt nia nib nii nin nio nip nir nit nna nnb nni nnn nno nnp nnt no- noa nob noi non noo nop nor not npa npb npi npn npo npp npr npt nra nrb nri nrn nro nrp nrr nrt nta ntb nti ntn nto ntp ntr ntt o-i oaa oab oai oan oao oap oar oat ob- oba obb obi obn obo obp obr obt oia oib oii oin oio oip oir oit on- ona onb oni onn ono onp onr ont oo- ooa oob ooi oon ooo oop oor oot op- opa opb opi opn opo opp opr opt or- ora orb ori orn oro orp orr ort ot- ota otb oti otn oto otp otr ott p-p paa pab pai pan pao pap par pat pba pbb pbi pbn pbo pbp pbr pbt pia pib pii pin pio pip pir pit pn- pna pnb pni pnn pno pnp pnr pnt poa pob poi pon poo pop por pot ppa ppb ppi ppn ppo ppp ppr ppt pra prb pri prn pro prp prr prt pt- pta ptb pti ptn pto ptp ptr ptt ra- raa rab rai ran rao rap rar rat rba rbb rbi rbn rbo rbp rbr rbt ria rib rii rin rio rip rir rit rna rnb rni rnn rno rnp rnr rnt roa rob roi ron roo rop ror rot rpa rpb rpi rpn rpo rpp rpr rpt rra rrb rri rrn rrp rrr rrt rta rtb rti rtn rto rtp rtr rtt taa tab tai tan tao tap tar tat tba tbb tbi tbn tbo tbp tbr tbt tia tib tii tin tio tip tir tit tna tnb tni tnn tno tnp tnr tnt to- toa tob toi ton too top tor tot tpa tpb tpi tpn tpo tpp tpr tpt tra trb tri trn tro trp trr trt tta ttb tti ttn tto ttp ttr ttt