nnn nno nns nnt no- non noo nor nos not nrn nro nrr nrs nrt nsn nso nsr nss nst ntn nto ntr nts ntt on- onn ono onr ons ont oo- oon ooo oor oos oot or- orn oro orr ors ort os- osn oso osr oss ost ot- otn oto otr ots ott rnn rno rnr rns rnt ron roo ror ros rot rrn rrr rrs rrt rsn rso rsr rss rst rtn rto rtr rts rtt snn sno snr sns snt son soo sor sos sot sr- srn sro srr srs srt ss- ssn sso ssr sss sst stn sto str sts stt tnn tno tnr tns tnt to- ton too tor tos tot trn tro trr trs trt tsn tso tsr tss tst ttn tto ttr tts ttt