a-a a-b a-i a-t aaa aab aaf aai aan aao aap aar aat ab- aba abb abf abi abn abo abp abr abt af- afa afb aff afi afn afo afp afr aft ai- aia aib aif aii ain aio aip air ait an- ana anb anf ani ann ano anp anr ant aoa aob aof aoi aon aoo aop aor aot ap- apa apb apf api apn apo app apr apt ar- ara arb arf ari arn aro arp arr art at- ata atb atf ati atn ato atp atr att b-p baa bab baf bai ban bao bap bar bat bba bbb bbf bbi bbn bbo bbp bbr bbt bfa bfb bff bfi bfn bfo bfp bfr bft bi- bia bib bif bii bin bio bip bir bit bna bnb bnf bni bnn bno bnp bnr bnt boa bob bof boi bon boo bop bor bot bpa bpb bpf bpi bpn bpo bpp bpr bpt bra brb brf bri brn bro brp brr brt bta btb btf bti btn bto btp btr btt faa fab faf fai fan fao fap far fat fba fbb fbf fbi fbn fbo fbp fbr fbt ffa fff ffi ffn ffo ffp ffr fft fia fib fif fii fin fip fir fit fna fnb fnf fni fnn fnp fnr fnt foa fob fof foi fon foo fop for fot fpa fpb fpi fpn fpo fpp fpr fpt fra frb frf fri frn fro frp frr frt fta ftb ftf fti ftn fto ftp ftr ftt i-f ia- iaa iab iaf iai ian iao iap iar iat iba ibb ibf ibi ibn ibo ibp ibr ibt ifa ifb iff ifi ifn ifo ifp ifr ift iia iib iif iii iin iio iip iir iit in- ina inb inf ini inn ino inp inr int io- ioa iob iof ioi ion ioo iop ior iot ipa ipb ipf ipi ipn ipo ipp ipr ipt ir- ira irb irf iri irn iro irp irr irt ita itb itf iti itn ito itp itt n-i naa nab naf nai nan nao nap nar nat nba nbb nbf nbi nbn nbo nbp nbr nbt nfa nfb nff nfi nfn nfo nfp nfr nft nia nib nif nii nin nio nip nir nit nna nnb nnf nni nnn nno nnp nnt no- noa nob nof noi non noo nop nor not npa npb npf npi npn npo npp npr npt nra nrb nrf nri nrn nro nrp nrr nrt nta ntb ntf nti ntn nto ntp ntr ntt o-i oaa oab oaf oai oan oao oap oar oat ob- oba obb obf obi obn obo obp obr obt of- ofa ofb off ofi ofn ofo ofp ofr oft oia oib oif oii oin oio oip oir oit on- ona onb onf oni onn ono onp onr ont oo- ooa oob oof ooi oon ooo oop oor oot op- opa opb opf opi opn opo opp opr opt or- ora orb orf ori orn oro orp orr ort ot- ota otb otf oti otn oto otp otr ott p-p paa pab paf pai pan pao pap par pat pba pbb pbf pbi pbn pbo pbp pbr pbt pfa pfb pff pfi pfn pfo pfp pfr pft pia pib pif pii pin pio pip pir pit pn- pna pnb pnf pni pnn pno pnp pnr pnt poa pob pof poi pon poo pop por pot ppa ppb ppf ppi ppn ppo ppp ppr ppt pra prb prf pri prn pro prp prr prt pt- pta ptb ptf pti ptn pto ptp ptr ptt ra- raa rab raf rai ran rao rap rar rat rba rbb rbf rbi rbn rbo rbp rbr rbt rfa rfb rff rfi rfn rfo rfp rfr rft ria rib rif rii rin rio rip rir rit rna rnb rni rnn rno rnp rnr rnt roa rob rof roi ron roo rop ror rot rpa rpb rpf rpi rpn rpo rpp rpr rpt rra rrb rrf rri rrn rrp rrr rrt rta rtb rtf rti rtn rto rtp rtr rtt taa tab taf tai tan tao tap tar tat tba tbb tbf tbi tbn tbo tbp tbr tbt tfa tfb tff tfi tfn tfo tfp tfr tft tia tib tif tii tin tio tip tir tit tna tnb tnf tni tnn tno tnp tnr tnt to- toa tob tof toi ton too top tor tot tpa tpb tpf tpi tpn tpo tpp tpr tpt tra trb trf tri trn tro trp trr trt tta ttb ttf tti ttn tto ttp ttr ttt