-ic a-a a-c a-i a-t aaa aac aai aao aat aax ac- aca acc aci aco act acx ai- aia aic aii aio ait aix aoa aoc aoi aoo aot aox at- ata atc ati ato att atx ax- axa axi axo axt axx c-- caa cac cai cao cat cax cca ccc cci cco cct ccx ci- cia cic cii cio cit cix co- coa coc coi coo cot cox cta ctc cti cto ctt ctx cxc cxi cxo cxt cxx ia- iaa iac iai iao iat ica icc ici ico ict iia iic iii iio iit iix io- ioa ioc ioi ioo iot ita itc iti ito itt itx ixc ixi o-i oaa oac oai oao oat oax oc- oca occ oci oco oct ocx oia oic oii oio oit oo- ooa ooc ooi ooo oot oox ot- ota otc oti oto ott ox- oxa oxc oxi oxo oxt oxx t-x taa tac tai tao tat tax tca tcc tci tco tct tcx tia tic tii tio tit tix to- toa toc toi too tot tox tta ttc tti tto ttt ttx txi txt xaa xac xat xci xcx xia xic xii xio xit xix xoa xoc xoi xoo xot xox xtc xti xtx xxi xxo xxx