b-u bbb bbc bbr bbs bbu bby bcb bcc bcr bcs bcu bcy brb brr brs bru bry bsb bsc bsr bss bsu bsy bub buc bur bus buu buy by- byc byr bys byu c-- cbb cbc cbr cbs cbu cby ccb ccc ccr ccs ccu crb crc crr crs cru cry csb csc csr css csu csy cub cuc cur cus cuu cuy cyb cyc cyr cys rbb rbc rbr rbs rbu rcb rcc rcr rcs rcu rrb rrc rrr rrs rru rsb rsc rsr rss rsu rub ruc rur rus ruu ruy ry- ryc ryr rys ryu ryy sbb sbc sbr sbs sbu sby scb scc scr scs scu sr- srb src srr srs sry ss- ssb ssc ssr sss ssu sub suc sur sus suu suy sy- syb syc syr sys syu ubb ubc ubr ubs ubu uby ucb ucc ucr ucs ucu ur- urb urc urr urs uru ury usb usc usr uss usu uuc uur uus uuu uyc uys uyu ybc ybr ybs yby ycc ycs ycu ycy yrc yrs yru ysb ysc ysr yss ysu ysy yur yus yuu yuy yyb yyc yys yyu yyy