-er a-a a-c a-t aaa aac aad aae aan aar aat aax ac- aca acc acd ace acn acr act acx ad- ada adc add ade adn adr adt adx aea aec aed aee aen aer aet aex an- ana anc and ane ann anr ant anx ar- ara arc ard are arn arr art arx at- ata atc atd ate atn atr att atx ax- axa axe axn axr axt axx c-- caa cac cad cae can car cat cax cca ccc ccd cce ccn ccr cct ccx cda cdc cdd cde cdn cdr cdt cdx ce- cea cec ced cee cen cer cet cex cn- cna cnc cnd cne cnn cnr cnt cnx cra crc crd cre crn crr crt crx cta ctc ctd cte ctn ctr ctt ctx cxc cxr cxt cxx daa dac dad dae dan dar dat dax dca dcc dcd dce dcn dcr dct dcx dda ddc ddd dde ddn ddr ddt ddx de- dea dec ded dee den der det dex dna dnc dnd dne dnn dnr dnt dra drc drd dre drn drr drt drx dta dtc dtd dte dtn dtr dtt dtx dxc dxd dxn dxr dxt dxx eaa eac ead eae ean ear eat eax ec- eca ecc ecd ece ecn ecr ect ecx ed- eda edc edd ede edn edr edt edx eea eec eed eee een eer eet eex en- ena enc end ene enn enr ent era erc erd ere ern err ert eta etc etd ete etn etr ett etx ex- exa exc exd exe exr ext exx naa nac nad nae nan nar nat nax nca ncc ncd nce ncn ncr nct ncx nda ndc ndd nde ndn ndr ndt ne- nea nec ned nee nen ner net nex nna nnc nne nnn nnt nra nrc nrd nre nrn nrr nrt nrx nta ntc ntd nte ntn ntr ntt ntx nxc nxd nxt ra- raa rac rad rae ran rar rat rax rca rcc rcd rce rcn rcr rct rcx rda rdc rdd rde rdn rdr rdt rdx re- rea rec red ree ren rer ret rex rna rnc rnd rnn rnr rnt rra rrc rrd rrn rrr rrt rta rtc rtd rte rtn rtr rtt rtx rxr t-x taa tac tad tae tan tar tat tax tca tcc tcd tce tcn tcr tct tcx tda tdc tdd tde tdn tdr tdt tdx te- tea tec ted tee ten ter tet tex tna tnc tnd tne tnn tnr tnt tnx tra trc trd tre trn trr trt trx tta ttc ttd tte ttn ttr ttt ttx txe txn txt xaa xac xad xan xar xat xcd xcr xcx xda xdc xde xdr xdt xed xee xen xer xet xex xna xnc xrc xrd xrt xrx xtc xtr xtx xxx