iii iin iio iip iis iit iix in- ini inn ino inp ins int inx io- ioi ion ioo iop ios iot ipi ipn ipo ipp ips ipt ipx is- isi isn iso isp iss ist iti itn ito itp its itt itx ixi ixn n-i nii nin nio nip nis nit nix nni nnn nno nnp nns nnt no- noi non noo nop nos not nox npi npn npo npp nps npt nsi nsn nso nsp nss nst nsx nti ntn nto ntp nts ntt ntx nxt o-i oii oin oio oip ois oit on- oni onn ono onp ons ont onx oo- ooi oon ooo oop oos oot oox op- opi opn opo opp ops opt opx os- osi osn oso osp oss ost osx ot- oti otn oto otp ots ott ox- oxi oxn oxo oxt oxx p-p pii pin pio pip pis pit pix pn- pni pnn pno pnp pns pnt pnx poi pon poo pop pos pot pox ppi ppn ppo ppp pps ppt ppx ps- psi psn pso psp pss pst psx pt- pti ptn pto ptp pts ptt ptx pxs pxt sii sin sio sip sis sit six sni snn sno snp sns snt soi son soo sop sos sot sox spi spn spo spp sps spt spx ss- ssi ssn sso ssp sss sst ssx sti stn sto stp sts stt stx sxi sxn sxs sxt t-x tii tin tio tip tis tit tix tni tnn tno tnp tns tnt tnx to- toi ton too top tos tot tox tpi tpn tpo tpp tps tpt tpx tsi tsn tso tsp tss tst tsx tti ttn tto ttp tts ttt ttx txi txn txs txt xii xin xio xis xit xix xno xns xoi xon xoo xop xos xot xox xpn xpo xpp xps xpt xsi xsp xss xst xti xtp xts xtx xxi xxo xxp xxx