-ic a-a a-b a-c a-i a-t aaa aab aac aae aai aao aas aat aax ab- aba abb abc abe abi abo abs abt abx ac- aca acb acc ace aci aco acs act acx aea aeb aec aee aei aeo aes aet aex ai- aia aib aic aie aii aio ais ait aix aoa aob aoc aoe aoi aoo aos aot aox as- asa asb asc ase asi aso ass ast asx at- ata atb atc ate ati ato ats att atx ax- axa axe axi axo axs axt axx baa bab bac bae bai bao bas bat bax bba bbb bbc bbe bbi bbo bbs bbt bbx bca bcb bcc bce bci bco bcs bct bcx be- bea beb bec bee bei beo bes bet bex bi- bia bib bic bie bii bio bis bit bix boa bob boc boe boi boo bos bot box bsa bsb bsc bse bsi bso bss bst bsx bta btb btc bte bti bto bts btt btx bxb bxi bxo bxx c-- caa cab cac cae cai cao cas cat cax cba cbb cbc cbe cbi cbo cbs cbt cbx cca ccb ccc cce cci cco ccs cct ccx ce- cea ceb cec cee cei ceo ces cet cex ci- cia cib cic cie cii cio cis cit cix co- coa cob coc coe coi coo cos cot cox csa csb csc cse csi cso css cst csx cta ctb ctc cte cti cto cts ctt ctx cxc cxi cxo cxs cxt cxx eaa eab eac eae eai eao eas eat eax eba ebb ebc ebe ebi ebo ebs ebt ebx ec- eca ecb ecc ece eci eco ecs ect ecx eea eeb eec eee eeo ees eet eex eia eib eic eie eii eio eis eit eix eo- eoa eob eoc eoe eoi eoo eos eot es- esa esb esc ese esi eso ess est esx eta etb etc ete eti eto ets ett etx ex- exa exc exe exi exo exs ext exx ia- iaa iab iac iae iai iao ias iat iba ibb ibc ibe ibi ibo ibs ibt ibx ica icb icc ice ici ico ics ict ie- iea iec iee iei ies iet iex iia iib iic iie iii iio iis iit iix io- ioa iob ioc ioe ioi ioo ios iot is- isa isb isc ise isi iso iss ist ita itb itc ite iti ito its itt itx ixc ixe ixi o-i oaa oab oac oae oai oao oas oat oax ob- oba obb obc obe obi obo obs obt obx oc- oca ocb occ oci oco ocs oct ocx oea oeb oec oee oei oeo oes oet oex oia oib oic oie oii oio ois oit oo- ooa oob ooc ooi ooo oos oot oox os- osa osb osc ose osi oso oss ost osx ot- ota otb otc ote oti oto ots ott ox- oxa oxb oxc oxi oxo oxt oxx saa sab sac sae sai sao sas sat sax sba sbb sbc sbe sbi sbo sbs sbt sbx sca scb scc sce sci sco scs sct scx se- sea seb sec see sei seo ses set sex sia sib sic sie sii sio sis sit six soa sob soc soe soi soo sos sot sox ss- ssa ssb ssc sse ssi sso sss sst ssx sta stb stc ste sti sto sts stt stx sxc sxi sxs sxt t-x taa tab tac tae tai tao tas tat tax tba tbb tbc tbe tbi tbo tbs tbt tca tcb tcc tce tci tco tcs tct tcx te- tea teb tec tee tei teo tes tet tex tia tib tic tie tii tio tis tit tix to- toa tob toc toe toi too tos tot tox tsa tsb tsc tse tsi tso tss tst tsx tta ttb ttc tte tti tto tts ttt ttx txe txi txs txt xaa xac xas xat xbc xbe xbx xcb xci xcx xee xes xet xex xia xic xie xii xio xis xit xix xoa xoc xoi xoo xos xot xox xsa xsb xsc xsi xss xst xtc xti xts xtx xxi xxo xxx