orn oro orr oru ou- ouc oue ouf oui ouk oun ouo our rbb rbc rbe rbf rbg rbi rbk rbn rbo rbr rbu rcb rcc rce rcf rcg rci rcn rco rcr rcu re- reb rec ree ref reg rei rek ren reo rer reu rfb rfc rfe rff rfg rfi rfk rfn rfo rfr rfu rgb rgc rge rgf rgg rgi rgk rgn rgo rgr rib ric rie rif rig rii rik rin rio rir rkb rkc rke rkf rkg rkk rko rku rnb rnc rng rni rnn rno rnr rnu rob roc roe rof rog roi rok ron roo ror rou rrb rrc rrf rrg rri rrk rrn rrr rru rub ruc rue ruf rug rui ruk run ruo rur ruu ubb ubc ube ubf ubg ubi ubk ubn ubo ubr ubu ucb ucc uce ucf ucg uci uck ucn uco ucr ucu ueb uec uee uef ueg uei uen uer ufc ufe uff ufg ufi ufn ufo ufr ufu ugb ugc uge ugf ugg ugi ugk ugn ugo ugr ugu uib uic uie uif uig uii uin uio uir uiu ukb ukc uke ukf uki ukk ukn ukr uku un- unb unc une unf ung uni unk unn uno unr unu uob uoc uoe uog uok uon uoo uor ur- urb urc ure urf urg uri urk urn uro urr uru uuc uue uug uun uur uuu