okg oki okk okl oko okr ola olb olc olf olg oli olk oll olo olt oo- ooa oob ooc oof oog ooi ook ool ooo oor oot or- ora orb orc orf org ori ork orl oro orr ort ot- ota otb otc otf otg oti otk otl oto otr ott ra- raa rab rac raf rag rai rak ral rao rar rat rba rbb rbc rbf rbg rbi rbk rbl rbo rbr rbt rca rcb rcc rcf rcg rci rcl rco rcr rct rfa rfb rfc rff rfg rfi rfk rfl rfo rfr rft rga rgb rgc rgf rgg rgi rgk rgo rgr rgt ria rib ric rif rig rii rik ril rio rir rit rkb rkc rkf rkg rkk rko rkt rla rlc rlf rlg rli rll rlo rlr rlt roa rob roc rof rog roi rok rol roo ror rot rra rrb rrc rrf rrg rri rrk rrl rrr rrt rta rtb rtc rtf rtg rti rtk rtl rto rtr rtt taa tab tac taf tag tai tak tal tao tar tat tba tbb tbc tbf tbg tbi tbk tbl tbo tbr tbt tca tcb tcc tcf tcg tci tck tcl tco tcr tct tfa tfb tfc tff tfg tfi tfk tfl tfo tfr tft tga tgb tgc tgf tgg tgi tgk tgl tgo tgr tgt tia tib tic tif tig tii tik til tio tir tit tka tkb tkc tkg tkk tkl tko tkr tkt tla tlc tlf tlg tli tlk tll tlo tlr tlt to- toa tob toc tof tog toi tok tol too tor tot tra trb trc trf trg tri trk trl tro trr trt tta ttb ttc ttf ttg tti ttk ttl tto ttr ttt