-ic a-a a-b a-c a-i a-t aaa aab aac aai aan aao aat aax ab- aba abb abc abi abn abo abt abx ac- aca acb acc aci acn aco act acx ai- aia aib aic aii ain aio ait aix an- ana anb anc ani ann ano ant anx aoa aob aoc aoi aon aoo aot aox at- ata atb atc ati atn ato att atx ax- axa axi axn axo axt axx baa bab bac bai ban bao bat bax bba bbb bbc bbi bbn bbo bbt bbx bca bcb bcc bci bcn bco bct bcx bi- bia bib bic bii bin bio bit bix bna bnb bnc bni bnn bno bnt bnx boa bob boc boi bon boo bot box bta btb btc bti btn bto btt btx bxb bxi bxn bxo bxx c-- caa cab cac cai can cao cat cax cba cbb cbc cbi cbn cbo cbt cbx cca ccb ccc cci ccn cco cct ccx ci- cia cib cic cii cin cio cit cix cn- cna cnb cnc cni cnn cno cnt cnx co- coa cob coc coi con coo cot cox cta ctb ctc cti ctn cto ctt ctx cxc cxi cxo cxt cxx ia- iaa iab iac iai ian iao iat iba ibb ibc ibi ibn ibo ibt ibx ica icb icc ici icn ico ict iia iib iic iii iin iio iit iix in- ina inb inc ini inn ino int inx io- ioa iob ioc ioi ion ioo iot ita itb itc iti itn ito itt itx ixc ixi ixn n-i naa nab nac nai nan nao nat nax nba nbb nbc nbi nbn nbo nbt nbx nca ncb ncc nci ncn nco nct ncx nia nib nic nii nin nio nit nix nna nnb nnc nni nnn nno nnt no- noa nob noc noi non noo not nox nta ntb ntc nti ntn nto ntt ntx nxc nxt o-i oaa oab oac oai oan oao oat oax ob- oba obb obc obi obn obo obt obx oc- oca ocb occ oci ocn oco oct ocx oia oib oic oii oin oio oit on- ona onb onc oni onn ono ont onx oo- ooa oob ooc ooi oon ooo oot oox ot- ota otb otc oti otn oto ott ox- oxa oxb oxc oxi oxn oxo oxt oxx t-x taa tab tac tai tan tao tat tax tba tbb tbc tbi tbn tbo tbt tca tcb tcc tci tcn tco tct tcx tia tib tic tii tin tio tit tix tna tnb tnc tni tnn tno tnt tnx to- toa tob toc toi ton too tot tox tta ttb ttc tti ttn tto ttt ttx txi txn txt xaa xac xan xat xbc xbx xcb xci xcx xia xic xii xin xio xit xix xna xnc xno xoa xoc xoi xon xoo xot xox xtc xti xtx xxi xxo xxx