i-v iii iin iio iip iir iis in- ini inn ino inp inr ins inv io- ioi ion ioo iop ior ios iov ipi ipn ipo ipp ipr ips ipv ir- iri irn iro irp irr irs irv is- isi isn iso isp isr iss isv ivi ivo ivp ivr ivs ivv n-i nii nin nio nip nir nis niv nni nnn nno nnp nns nnv no- noi non noo nop nor nos nov npi npn npo npp npr nps npv nri nrn nro nrp nrr nrs nrv nsi nsn nso nsp nsr nss nsv nvi nvn nvp nvv o-i oii oin oio oip oir ois oiv on- oni onn ono onp onr ons oo- ooi oon ooo oop oor oos oov op- opi opn opo opp opr ops opv or- ori orn oro orp orr ors orv os- osi osn oso osp osr oss osv ov- ovi ovo ovp ovs ovv p-p pii pin pio pip pir pis piv pn- pni pnn pno pnp pnr pns pnv poi pon poo pop por pos pov ppi ppn ppo ppp ppr pps ppv pri prn pro prp prr prs prv ps- psi psn pso psp psr pss psv pvi pvn pvo pvp pvr pvs pvv rii rin rio rip rir ris riv rni rnn rno rnp rnr rns rnv roi ron roo rop ror ros rov rpi rpn rpo rpp rpr rps rpv rri rrn rrp rrr rrs rsi rsn rso rsp rsr rss rsv rvi rvn rvo rvp rvr rvs rvv sii sin sio sip sir sis siv sni snn sno snp snr sns snv soi son soo sop sor sos sov spi spn spo spp spr sps spv sr- sri srn sro srp srr srs srv ss- ssi ssn sso ssp ssr sss ssv svi svn svo svp svr svs svv vi- vii vin vio vip vir vis viv vn- vni vno vnp vnr vns vnv voi von voo vop vor vos vov vpi vpn vpo vpp vpr vps vri vrn vrp vrr vrs vsi vsn vso vsp vsr vss vsv vvi vvo vvr vvs vvv