iii iin iio iip iis iit in- ini inn ino inp ins int io- ioi ion ioo iop ios iot ipi ipn ipo ipp ips ipt is- isi isn iso isp iss ist iti itn ito itp its itt n-i nii nin nio nip nis nit nni nnn nno nnp nns nnt no- noi non noo nop nos not npi npn npo npp nps npt nsi nsn nso nsp nss nst nti ntn nto ntp nts ntt o-i oii oin oio oip ois oit on- oni onn ono onp ons ont oo- ooi oon ooo oop oos oot op- opi opn opo opp ops opt os- osi osn oso osp oss ost ot- oti otn oto otp ots ott p-p pii pin pio pip pis pit pn- pni pnn pno pnp pns pnt poi pon poo pop pos pot ppi ppn ppo ppp pps ppt ps- psi psn pso psp pss pst pt- pti ptn pto ptp pts ptt sii sin sio sip sis sit sni snn sno snp sns snt soi son soo sop sos sot spi spn spo spp sps spt ss- ssi ssn sso ssp sss sst sti stn sto stp sts stt tii tin tio tip tis tit tni tnn tno tnp tns tnt to- toi ton too top tos tot tpi tpn tpo tpp tps tpt tsi tsn tso tsp tss tst tti ttn tto ttp tts ttt