iii iin iio iip iir iis in- ini inn ino inp inq inr ins io- ioi ion ioo iop ior ios ipi ipn ipo ipp ipr ips iqs ir- iri irn iro irp irq irr irs is- isi isn iso isp isq isr iss n-i nii nin nio nip niq nir nis nni nnn nno nnp nns no- noi non noo nop nor nos npi npn npo npp npr nps nqs 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 opq opr ops oqo or- ori orn oro orp orr ors os- osi osn oso osp osq osr oss p-p pii pin pio pip piq pir pis pn- pni pnn pno pnp pnr pns poi pon poo pop por pos ppi ppn ppo ppp ppq ppr pps pqi pqq pqr pqs pri prn pro prp prq prr prs ps- psi psn pso psp psr pss qin qio qip qir qis qni qns qoi qoo qop qor qos qpp qpr qps qqq qri qrp qrs qsi qso qsp qsr rii rin rio rip riq rir ris rni rnn rno rnp rnr rns roi ron roo rop ror ros rpi rpn rpo rpp rpr rps rqn rqs rri rrn rrp rrq rrr rrs rsi rsn rso rsp rsq rsr rss sii sin sio sip siq sir sis sni snn sno snp snr sns soi son soo sop soq sor sos spi spn spo spp spq spr sps sqi sqn sqq sqr sqs sr- sri srn sro srp srq srr srs ss- ssi ssn sso ssp ssq ssr sss