a-a a-b a-i a-t aaa aab aaf aai aao aap aar aat ab- aba abb abf abi abo abp abr abt af- afa afb aff afi afo afp afr aft ai- aia aib aif aii aio aip air ait aoa aob aof aoi aoo aop aor aot ap- apa apb apf api apo app apr apt ar- ara arb arf ari aro arp arr art at- ata atb atf ati ato atp atr att b-p baa bab baf bai bao bap bar bat bba bbb bbf bbi bbo bbp bbr bbt bfa bfb bff bfi bfo bfp bfr bft bi- bia bib bif bii bio bip bir bit boa bob bof boi boo bop bor bot bpa bpb bpf bpi bpo bpp bpr bpt bra brb brf bri bro brp brr brt bta btb btf bti bto btp btr btt faa fab faf fai fao fap far fat fba fbb fbf fbi fbo fbp fbr fbt ffa fff ffi ffo ffp ffr fft fia fib fif fii fip fir fit foa fob fof foi foo fop for fot fpa fpb fpi fpo fpp fpr fpt fra frb frf fri fro frp frr frt fta ftb ftf fti fto ftp ftr ftt i-f ia- iaa iab iaf iai iao iap iar iat iba ibb ibf ibi ibo ibp ibr ibt ifa ifb iff ifi ifo ifp ifr ift iia iib iif iii iio iip iir iit io- ioa iob iof ioi ioo iop ior iot ipa ipb ipf ipi ipo ipp ipr ipt ir- ira irb irf iri iro irp irr irt ita itb itf iti ito itp itt o-i oaa oab oaf oai oao oap oar oat ob- oba obb obf obi obo obp obr obt of- ofa ofb off ofi ofo ofp ofr oft oia oib oif oii oio oip oir oit oo- ooa oob oof ooi ooo oop oor oot op- opa opb opf opi opo opp opr opt or- ora orb orf ori oro orp orr ort ot- ota otb otf oti oto otp otr ott p-p paa pab paf pai pao pap par pat pba pbb pbf pbi pbo pbp pbr pbt pfa pfb pff pfi pfo pfp pfr pft pia pib pif pii pio pip pir pit poa pob pof poi poo pop por pot ppa ppb ppf ppi ppo ppp ppr ppt pra prb prf pri pro prp prr prt pt- pta ptb ptf pti pto ptp ptr ptt ra- raa rab raf rai rao rap rar rat rba rbb rbf rbi rbo rbp rbr rbt rfa rfb rff rfi rfo rfp rfr rft ria rib rif rii rio rip rir rit roa rob rof roi roo rop ror rot rpa rpb rpf rpi rpo rpp rpr rpt rra rrb rrf rri rrp rrr rrt rta rtb rtf rti rto rtp rtr rtt taa tab taf tai tao tap tar tat tba tbb tbf tbi tbo tbp tbr tbt tfa tfb tff tfi tfo tfp tfr tft tia tib tif tii tio tip tir tit to- toa tob tof toi too top tor tot tpa tpb tpf tpi tpo tpp tpr tpt tra trb trf tri tro trp trr trt tta ttb ttf tti tto ttp ttr ttt