c-- ccc ccr ccs ccu crc crr crs cru cry csc csr css csu csy cuc cur cus cuu cuy cyc cyr cys rcc rcr rcs rcu rrc rrr rrs rru rsc rsr rss rsu ruc rur rus ruu ruy ry- ryc ryr rys ryu ryy scc scr scs scu sr- src srr srs sry ss- ssc ssr sss ssu suc sur sus suu suy sy- syc syr sys syu ucc ucr ucs ucu ur- urc urr urs uru ury usc usr uss usu uuc uur uus uuu uyc uys uyu ycc ycs ycu ycy yrc yrs yru ysc ysr yss ysu ysy yur yus yuu yuy yyc yys yyu yyy