obr obt oc- oca ocb occ ocf ocg oci ocm ocn oco ocr oct of- ofa ofb ofc off ofg ofi ofm ofn ofo ofr oft oga ogc ogf ogg ogi ogn ogo ogt oia oib oic oif oii oim oin oio oir oit om- oma omb omc omf omg omi omm omn omo omr omt on- ona onb onc onf ong oni onn ono onr ont oo- ooa oob ooc oof oog ooi oom oon ooo oor oot or- ora orb orc orf org ori orm orn oro orr ort ot- ota otb otc otf otg oti otm otn oto otr ott ra- raa rab rac raf rag rai ram ran rao rar rat rba rbb rbc rbf rbg rbi rbm rbn rbo rbr rbt rca rcb rcc rcf rcg rci rcm rcn rco rcr rct rfa rfb rfc rff rfg rfi rfm rfn rfo rfr rft rga rgb rgc rgf rgg rgi rgn rgo rgr rgt ria rib ric rif rig rii rim rin rio rir rit rma rmb rmc rmf rmg rmi rmm rmn rmo rmr rmt rna rnb rnc rng rni rnm rnn rno rnr rnt roa rob roc rof rog roi rom ron roo ror rot rra rrb rrc rrf rrg rri rrm rrn rrr rrt rta rtb rtc rtf rtg rti rtm rtn rto rtr rtt taa tab tac taf tag tai tam tan tao tar tat tba tbb tbc tbf tbg tbi tbm tbn tbo tbr tbt tca tcb tcc tcf tcg tci tcm tcn tco tcr tct tfa tfb tfc tff tfg tfi tfm tfn tfo tfr tft tga tgb tgc tgf tgg tgi tgm tgn tgo tgr tgt tia tib tic tif tig tii tim tin tio tir tit tma tmb tmc tmf tmg tmi tmm tmn tmo tmr tmt tna tnb tnc tnf tng tni tnm tnn tno tnr tnt to- toa tob toc tof tog toi tom ton too tor tot tra trb trc trf trg tri trm trn tro trr trt tta ttb ttc ttf ttg tti ttm ttn tto ttr ttt