okk okl oko okr ola olc old ole olf olk oll olo olt oo- ooa ooc ood oof ooh ook ool ooo oor oot or- ora orc ord ore orf orh ork orl oro orr ort ot- ota otc otd ote otf oth otk otl oto otr ott ra- raa rac rad rae raf rah rak ral rao rar rat rca rcc rcd rce rcf rch rcl rco rcr rct rda rdc rdd rde rdf rdh rdl rdo rdr rdt re- rea rec red ree ref reh rek rel reo rer ret rfa rfc rfd rfe rff rfh rfk rfl rfo rfr rft rh- rha rhc rhd rhe rhf rhh rhl rho rhr rht rkc rke rkf rkk rko rkt rla rlc rld rle rlf rlh rll rlo rlr rlt roa roc rod roe rof roh rok rol roo ror rot rra rrc rrd rrf rrh rrk rrl rrr rrt rta rtc rtd rte rtf rtk rtl rto rtr rtt taa tac tad tae taf tah tak tal tao tar tat tca tcc tcd tce tcf tch tck tcl tco tcr tct tda tdc tdd tde tdf tdh tdk tdl tdo tdr tdt te- tea tec ted tee tef teh tek tel teo ter tet tfa tfc tfd tfe tff tfh tfk tfl tfo tfr tft th- tha thc thd the thf thh thk thl tho thr tht tka tkc tke tkk tkl tko tkr tkt tla tlc tld tle tlf tlh tlk tll tlo tlr tlt to- toa toc tod toe tof toh tok tol too tor tot tra trc trd tre trf trh trk trl tro trr trt tta ttc ttd tte ttf tth ttk ttl tto ttr ttt