-th a-a a-b a-t aaa aab aaf aah aao aar aat ab- aba abb abf abh abo abr abt af- afa afb aff afh afo afr aft aha ahb ahf ahh aho ahr aht aoa aob aof aoh aoo aor aot ar- ara arb arf arh aro arr art at- ata atb atf ath ato atr att baa bab baf bah bao bar bat bba bbb bbf bbh bbo bbr bbt bfa bfb bff bfh bfo bfr bft bha bhb bhf bhh bho bhr bht boa bob bof boh boo bor bot bra brb brf brh bro brr brt bta btb btf bth bto btr btt faa fab faf fah fao far fat fba fbb fbf fbh fbo fbr fbt ffa fff ffh ffo ffr fft fha fhb fhf fhh fho fhr foa fob fof foh foo for fot fra frb frf frh fro frr frt fta ftb ftf fth fto ftr ftt haa hab haf hah hao har hat hba hbb hbf hbh hbo hbr hbt hfa hfb hff hfh hfo hfr hft hha hhb hhf hhh hho hhr hht hoa hob hof hoh hoo hor hot hr- hra hrb hrf hrh hro hrr hrt hta htb htf hth hto htr htt oaa oab oaf oah oao oar oat ob- oba obb obf obh obo obr obt of- ofa ofb off ofo ofr oft oha ohf ohh oho ohr oht oo- ooa oob oof ooh ooo oor oot or- ora orb orf orh oro orr ort ot- ota otb otf oth oto otr ott ra- raa rab raf rah rao rar rat rba rbb rbf rbh rbo rbr rbt rfa rfb rff rfh rfo rfr rft rh- rha rhb rhf rhh rho rhr rht roa rob rof roh roo ror rot rra rrb rrf rrh rrr rrt rta rtb rtf rto rtr rtt taa tab taf tah tao tar tat tba tbb tbf tbh tbo tbr tbt tfa tfb tff tfh tfo tfr tft th- tha thb thf thh tho thr tht to- toa tob tof toh too tor tot tra trb trf trh tro trr trt tta ttb ttf tth tto ttr ttt