-er -ic a-a a-c a-i a-t aaa aac aae aaf aai aao aar aat aax ac- aca acc ace acf aci aco acr act acx aea aec aee aef aei aeo aer aet aex af- afa afc afe aff afi afo afr aft afx ai- aia aic aie aif aii aio air ait aix aoa aoc aoe aof aoi aoo aor aot aox ar- ara arc are arf ari aro arr art arx at- ata atc ate atf ati ato atr att atx ax- axa axe axi axo axr axt axx c-- caa cac cae caf cai cao car cat cax cca ccc cce ccf cci cco ccr cct ccx ce- cea cec cee cef cei ceo cer cet cex cfa cfc cfe cff cfi cfo cfr cft cfx ci- cia cic cie cif cii cio cir cit cix co- coa coc coe cof coi coo cor cot cox cra crc cre crf cri cro crr crt crx cta ctc cte ctf cti cto ctr ctt ctx cxc cxf cxi cxo cxr cxt cxx eaa eac eae eaf eai eao ear eat eax ec- eca ecc ece ecf eci eco ecr ect ecx eea eec eee eef eeo eer eet eex ef- efa efc efe eff efi efo efr eft efx eia eic eie eif eii eio eir eit eix eo- eoa eoc eoe eof eoi eoo eor eot era erc ere erf eri ero err ert eta etc ete etf eti eto etr ett etx ex- exa exc exe exi exo exr ext exx faa fac fae faf fai fao far fat fax fca fcc fce fcf fci fco fcr fct fcx fea fec fee fef fei feo fer fet fex ffa ffc ffe fff ffi ffo ffr fft ffx fia fic fie fif fii fir fit fix foa foc foe fof foi foo for fot fox fra frc fre frf fri fro frr frt fta ftc fte ftf fti fto ftr ftt ftx fxe fxi fxr fxt fxx i-f ia- iaa iac iae iaf iai iao iar iat ica icc ice icf ici ico icr ict ie- iea iec iee ief iei ier iet iex ifa ifc ife iff ifi ifo ifr ift ifx iia iic iie iif iii iio iir iit iix io- ioa ioc ioe iof ioi ioo ior iot ir- ira irc ire irf iri iro irr irt irx ita itc ite itf iti ito itt itx ixc ixe ixi o-i oaa oac oae oaf oai oao oar oat oax oc- oca occ ocf oci oco ocr oct ocx oea oec oee oef oei oeo oer oet oex of- ofa ofc ofe off ofi ofo ofr oft ofx oia oic oie oif oii oio oir oit oo- ooa ooc oof ooi ooo oor oot oox or- ora orc ore orf ori oro orr ort orx ot- ota otc ote otf oti oto otr ott ox- oxa oxc oxf oxi oxo oxt oxx ra- raa rac rae raf rai rao rar rat rax rca rcc rce rcf rci rco rcr rct rcx re- rea rec ree ref rei reo rer ret rex rfa rfc rfe rff rfi rfo rfr rft ria ric rie rif rii rio rir rit rix roa roc roe rof roi roo ror rot rox rra rrc rrf rri rrr rrt rta rtc rte rtf rti rto rtr rtt rtx rxr t-x taa tac tae taf tai tao tar tat tax tca tcc tce tcf tci tco tcr tct tcx te- tea tec tee tef tei teo ter tet tex tfa tfc tfe tff tfi tfo tfr tft tfx tia tic tie tif tii tio tir tit tix to- toa toc toe tof toi too tor tot tox tra trc tre trf tri tro trr trt trx tta ttc tte ttf tti tto ttr ttt ttx txe txf txi txt xaa xac xaf xar xat xcf xci xcr xcx xee xer xet xex xfa xfe xft xfx xia xic xie xii xio xit xix xoa xoc xof xoi xoo xor xot xox xrc xrf xrt xrx xtc xtf xti xtr xtx xxi xxo xxx