i-v iii iin iio iip iis iix in- ini inn ino inp ins inv inx io- ioi ion ioo iop ios iov ipi ipn ipo ipp ips ipv ipx is- isi isn iso isp iss isv ivi ivo ivp ivs ivv ivx ixi ixn n-i nii nin nio nip nis niv nix nni nnn nno nnp nns nnv no- noi non noo nop nos nov nox npi npn npo npp nps npv nsi nsn nso nsp nss nsv nsx nvi nvn nvp nvv nxv o-i oii oin oio oip ois oiv on- oni onn ono onp ons onx oo- ooi oon ooo oop oos oov oox op- opi opn opo opp ops opv opx os- osi osn oso osp oss osv osx ov- ovi ovo ovp ovs ovv ox- oxi oxn oxo oxx p-p pii pin pio pip pis piv pix pn- pni pnn pno pnp pns pnv pnx poi pon poo pop pos pov pox ppi ppn ppo ppp pps ppv ppx ps- psi psn pso psp pss psv psx pvi pvn pvo pvp pvs pvv pxs sii sin sio sip sis siv six sni snn sno snp sns snv soi son soo sop sos sov sox spi spn spo spp sps spv spx ss- ssi ssn sso ssp sss ssv ssx svi svn svo svp svs svv svx sxi sxn sxs vi- vii vin vio vip vis viv vix vn- vni vno vnp vns vnv voi von voo vop vos vov vox vpi vpn vpo vpp vps vpx vsi vsn vso vsp vss vsv vvi vvo vvs vvv vxs vxv xii xin xio xis xiv xix xno xns xoi xon xoo xop xos xov xox xpn xpo xpp xps xsi xsp xss xvi xxi xxo xxp xxv xxx