oba obb obc obd obe obf obh obi obo obr obt oc- oca ocb occ ocd ocf och oci oco ocr oct oda odb odc odd ode odf odh odi odo odr odt oea oeb oec oed oee oef oeh oei oeo oer oet of- ofa ofb ofc ofd ofe off ofi ofo ofr oft oha ohc ohd ohe ohf ohh ohi oho ohr oht oia oib oic oid oie oif oii oio oir oit oo- ooa oob ooc ood oof ooh ooi ooo oor oot or- ora orb orc ord ore orf orh ori oro orr ort ot- ota otb otc otd ote otf oth oti oto otr ott ra- raa rab rac rad rae raf rah rai rao rar rat rba rbb rbc rbd rbe rbf rbh rbi rbo rbr rbt rca rcb rcc rcd rce rcf rch rci rco rcr rct rda rdb rdc rdd rde rdf rdh rdi rdo rdr rdt re- rea reb rec red ree ref reh rei reo rer ret rfa rfb rfc rfd rfe rff rfh rfi rfo rfr rft rh- rha rhb rhc rhd rhe rhf rhh rhi rho rhr rht ria rib ric rid rie rif rih rii rio rir rit roa rob roc rod roe rof roh roi roo ror rot rra rrb rrc rrd rrf rrh rri rrr rrt rta rtb rtc rtd rte rtf rti rto rtr rtt taa tab tac tad tae taf tah tai tao tar tat tba tbb tbc tbd tbe tbf tbh tbi tbo tbr tbt tca tcb tcc tcd tce tcf tch tci tco tcr tct tda tdb tdc tdd tde tdf tdh tdi tdo tdr tdt te- tea teb tec ted tee tef teh tei teo ter tet tfa tfb tfc tfd tfe tff tfh tfi tfo tfr tft th- tha thb thc thd the thf thh thi tho thr tht tia tib tic tid tie tif tih tii tio tir tit to- toa tob toc tod toe tof toh toi too tor tot tra trb trc trd tre trf trh tri tro trr trt tta ttb ttc ttd tte ttf tth tti tto ttr ttt