i-v iii iin iip iis in- ini inn inp ins inv ipi ipn ipp ips ipv is- isi isn isp iss isv ivi ivp ivs ivv n-i nii nin nip nis niv nni nnn nnp nns nnv npi npn npp nps npv nsi nsn nsp nss nsv nvi nvn nvp nvv p-p pii pin pip pis piv pn- pni pnn pnp pns pnv ppi ppn ppp pps ppv ps- psi psn psp pss psv pvi pvn pvp pvs pvv sii sin sip sis siv sni snn snp sns snv spi spn spp sps spv ss- ssi ssn ssp sss ssv svi svn svp svs svv vi- vii vin vip vis viv vn- vni vnp vns vnv vpi vpn vpp vps vsi vsn vsp vss vsv vvi vvs vvv