-ic a-a a-c a-i a-t aaa aac aai aao aas aat aax ac- aca acc aci aco acs act acx ai- aia aic aii aio ais ait aix aoa aoc aoi aoo aos aot aox as- asa asc asi aso ass ast asx at- ata atc ati ato ats att atx ax- axa axi axo axs axt axx c-- caa cac cai cao cas cat cax cca ccc cci cco ccs cct ccx ci- cia cic cii cio cis cit cix co- coa coc coi coo cos cot cox csa csc csi cso css cst csx cta ctc cti cto cts ctt ctx cxc cxi cxo cxs cxt cxx ia- iaa iac iai iao ias iat ica icc ici ico ics ict iia iic iii iio iis iit iix io- ioa ioc ioi ioo ios iot is- isa isc isi iso iss ist ita itc iti ito its itt itx ixc ixi o-i oaa oac oai oao oas oat oax oc- oca occ oci oco ocs oct ocx oia oic oii oio ois oit oo- ooa ooc ooi ooo oos oot oox os- osa osc osi oso oss ost osx ot- ota otc oti oto ots ott ox- oxa oxc oxi oxo oxt oxx saa sac sai sao sas sat sax sca scc sci sco scs sct scx sia sic sii sio sis sit six soa soc soi soo sos sot sox ss- ssa ssc ssi sso sss sst ssx sta stc sti sto sts stt stx sxc sxi sxs sxt t-x taa tac tai tao tas tat tax tca tcc tci tco tcs tct tcx tia tic tii tio tis tit tix to- toa toc toi too tos tot tox tsa tsc tsi tso tss tst tsx tta ttc tti tto tts ttt ttx txi txs txt xaa xac xas xat xci xcx xia xic xii xio xis xit xix xoa xoc xoi xoo xos xot xox xsa xsc xsi xss xst xtc xti xts xtx xxi xxo xxx