i-v iii iin iio iip iis in- ini inn ino inp ins inv io- ioi ion ioo iop ios iov ipi ipn ipo ipp ips ipv is- isi isn iso isp iss isv ivi ivo ivp ivs ivv n-i nii nin nio nip nis niv nni nnn nno nnp nns nnv no- noi non noo nop nos nov npi npn npo npp nps npv nsi nsn nso nsp nss nsv nvi nvn nvp nvv o-i oii oin oio oip ois oiv on- oni onn ono onp ons oo- ooi oon ooo oop oos oov op- opi opn opo opp ops opv os- osi osn oso osp oss osv ov- ovi ovo ovp ovs ovv p-p pii pin pio pip pis piv pn- pni pnn pno pnp pns pnv poi pon poo pop pos pov ppi ppn ppo ppp pps ppv ps- psi psn pso psp pss psv pvi pvn pvo pvp pvs pvv sii sin sio sip sis siv sni snn sno snp sns snv soi son soo sop sos sov spi spn spo spp sps spv ss- ssi ssn sso ssp sss ssv svi svn svo svp svs svv vi- vii vin vio vip vis viv vn- vni vno vnp vns vnv voi von voo vop vos vov vpi vpn vpo vpp vps vsi vsn vso vsp vss vsv vvi vvo vvs vvv