iii iin iio iip iir iis in- ini inn ino inp inr ins io- ioi ion ioo iop ior ios ipi ipn ipo ipp ipr ips ir- iri irn iro irp irr irs is- isi isn iso isp isr iss n-i nii nin nio nip nir nis nni nnn nno nnp nns no- noi non noo nop nor nos npi npn npo npp npr nps nri nrn nro nrp nrr nrs nsi nsn nso nsp nsr nss o-i oii oin oio oip oir ois on- oni onn ono onp onr ons oo- ooi oon ooo oop oor oos op- opi opn opo opp opr ops or- ori orn oro orp orr ors os- osi osn oso osp osr oss p-p pii pin pio pip pir pis pn- pni pnn pno pnp pnr pns poi pon poo pop por pos ppi ppn ppo ppp ppr pps pri prn pro prp prr prs ps- psi psn pso psp psr pss rii rin rio rip rir ris rni rnn rno rnp rnr rns roi ron roo rop ror ros rpi rpn rpo rpp rpr rps rri rrn rrp rrr rrs rsi rsn rso rsp rsr rss sii sin sio sip sir sis sni snn sno snp snr sns soi son soo sop sor sos spi spn spo spp spr sps sr- sri srn sro srp srr srs ss- ssi ssn sso ssp ssr sss