iii iin iio iir iis iix in- ini inn ino inr ins inx io- ioi ion ioo ior ios ir- iri irn iro irr irs irx is- isi isn iso isr iss ixi ixn n-i nii nin nio nir nis nix nni nnn nno nns no- noi non noo nor nos nox nri nrn nro nrr nrs nrx nsi nsn nso nsr nss nsx o-i oii oin oio oir ois on- oni onn ono onr ons onx oo- ooi oon ooo oor oos oox or- ori orn oro orr ors orx os- osi osn oso osr oss osx ox- oxi oxn oxo oxx rii rin rio rir ris rix rni rnn rno rnr rns roi ron roo ror ros rox rri rrn rrr rrs rsi rsn rso rsr rss rsx rxr rxs sii sin sio sir sis six sni snn sno snr sns soi son soo sor sos sox sr- sri srn sro srr srs srx ss- ssi ssn sso ssr sss ssx sxi sxn sxs xii xin xio xis xix xno xns xoi xon xoo xor xos xox xrx xsi xss xxi xxo xxx