a-a a-b a-q a-t aaa aab aae aan aaq aas aat ab- aba abb abe abn abq abs abt aea aeb aee aen aeq aes aet an- ana anb ane ann anq ans ant aqa aqn aqs aqt as- asa asb ase asn asq ass ast at- ata atb ate atn ats att baa bab bae ban baq bas bat bba bbb bbe bbn bbq bbs bbt be- bea beb bee ben beq bes bet bna bnb bne bnn bns bnt bqe bqt bsa bsb bse bsn bss bst bta btb bte btn btq bts btt eaa eab eae ean eas eat eba ebb ebe ebn ebq ebs ebt eea eeb eee een ees eet en- ena enb ene enn ens ent eqa eqe eqn eqq eqs eqt es- esa esb ese esn esq ess est eta etb ete etn ets ett naa nab nae nan nas nat nba nbb nbe nbn nbs nbt ne- nea neb nee nen nes net nna nnb nne nnn nns nnt nqs nqt nsa nsb nse nsn nss nst nta ntb nte ntn ntq nts ntt qaa qan qas qat qba qbe qbq qbs qee qen qet qnb qne qns qqq qsa qst qta qtq qts saa sab sae san saq sas sat sba sbb sbe sbn sbq sbs sbt se- sea seb see sen seq ses set sna snb sne snn sns snt sqa sqn sqq sqs ss- ssa ssb sse ssn ssq sss sst sta stb ste stn stq sts stt taa tab tae tan taq tas tat tba tbb tbe tbn tbs tbt te- tea teb tee ten teq tes tet tna tnb tne tnn tnq tns tnt tsa tsb tse tsn tsq tss tst tta ttb tte ttn tts ttt