-ic a-a a-c a-i a-t aaa aac aae aai aat aax ac- aca acc ace aci act acx aea aec aee aei aet aex ai- aia aic aie aii ait aix at- ata atc ate ati att atx ax- axa axe axi axt axx c-- caa cac cae cai cat cax cca ccc cce cci cct ccx ce- cea cec cee cei cet cex ci- cia cic cie cii cit cix cta ctc cte cti ctt ctx cxc cxi cxt cxx eaa eac eae eai eat eax ec- eca ecc ece eci ect ecx eea eec eee eet eex eia eic eie eii eit eix eta etc ete eti ett etx ex- exa exc exe exi ext exx ia- iaa iac iae iai iat ica icc ice ici ict ie- iea iec iee iei iet iex iia iic iie iii iit iix ita itc ite iti itt itx ixc ixe ixi t-x taa tac tae tai tat tax tca tcc tce tci tct tcx te- tea tec tee tei tet tex tia tic tie tii tit tix tta ttc tte tti ttt ttx txe txi txt xaa xac xat xci xcx xee xet xex xia xic xie xii xit xix xtc xti xtx xxi xxx