iii iin iis iit iix in- ini inn ins int inx is- isi isn iss ist iti itn its itt itx ixi ixn n-i nii nin nis nit nix nni nnn nns nnt nsi nsn nss nst nsx nti ntn nts ntt ntx nxt sii sin sis sit six sni snn sns snt ss- ssi ssn sss sst ssx sti stn sts stt stx sxi sxn sxs sxt t-x tii tin tis tit tix tni tnn tns tnt tnx tsi tsn tss tst tsx tti ttn tts ttt ttx txi txn txs txt xii xin xis xit xix xns xsi xss xst xti xts xtx xxi xxx