rrb rrc rrd rrg rrl rrn rrr rru rub ruc rud rue rug run ruo rur ruu ruy ry- ryc ryd rye ryg ryn ryo ryr ryu ryy ubb ubc ube ubg ubl ubn ubo ubr ubu uby ucb ucc ucd uce ucg ucl ucn uco ucr ucu udb udc udd ude udg udl udn udo udr udu ueb uec ued uee ueg uel uen uer uey ugb ugc uge ugg ugl ugn ugo ugr ugu ulb ulc uld ule ulg ull uln ulo ulr ulu uly un- unb unc und une ung unl unn uno unr unu uny uob uoc uod uoe uog uol uon uoo uor ur- urb urc urd ure urg url urn uro urr uru ury uuc uue uug uun uur uuu uyc uyo uyu ybc ybe ybg ybl ybr yby ycc ycd yce ycl yco ycu ycy yde ydg ydl ydn ydo ydy yeb yec yed yee yeg yel yen yeo yer yey ygc ygl ygo ylc yld yle ylg yll ylr yly ynd yne yng ynn ynu yny yob yoc yod yoe yog yol yon yoo yor you yoy yrc yre yrg yrn yro yru yud yue yug yul yun yuo yur yuu yuy yyb yyc yye yyg yyu yyy