iii iin iip iis iit in- ini inn inp ins int ipi ipn ipp ips ipt is- isi isn isp iss ist iti itn itp its itt n-i nii nin nip nis nit nni nnn nnp nns nnt npi npn npp nps npt nsi nsn nsp nss nst nti ntn ntp nts ntt p-p pii pin pip pis pit pn- pni pnn pnp pns pnt ppi ppn ppp pps ppt ps- psi psn psp pss pst pt- pti ptn ptp pts ptt sii sin sip sis sit sni snn snp sns snt spi spn spp sps spt ss- ssi ssn ssp sss sst sti stn stp sts stt tii tin tip tis tit tni tnn tnp tns tnt tpi tpn tpp tps tpt tsi tsn tsp tss tst tti ttn ttp tts ttt