ddd ddn ddo ddr dds dnd dnn dno dnr dns dod don doo dor dos drd drn dro drr drs dsd dsn dso dsr dss ndd ndn ndo ndr nds nnn nno nns no- nod non noo nor nos nrd nrn nro nrr nrs nsd nsn nso nsr nss odd odn odo odr ods on- ond onn ono onr ons oo- ood oon ooo oor oos or- ord orn oro orr ors os- osd osn oso osr oss rdd rdn rdo rdr rds rnd rnn rno rnr rns rod ron roo ror ros rrd rrn rrr rrs rsd rsn rso rsr rss sdd sdn sdo sdr sds snd snn sno snr sns sod son soo sor sos sr- srd srn sro srr srs ss- ssd ssn sso ssr sss