-ic a-a a-b a-c a-i a-t aaa aab aac aae aag aai aan aat ab- aba abb abc abe abg abi abn abt ac- aca acb acc ace acg aci acn act aea aeb aec aee aeg aei aen aet ag- aga agb agc age agg agi agn agt ai- aia aib aic aie aig aii ain ait an- ana anb anc ane ang ani ann ant at- ata atb atc ate atg ati atn att baa bab bac bae bag bai ban bat bba bbb bbc bbe bbg bbi bbn bbt bca bcb bcc bce bcg bci bcn bct be- bea beb bec bee beg bei ben bet bga bgb bgc bge bgg bgi bgn bgt bi- bia bib bic bie big bii bin bit bna bnb bnc bne bng bni bnn bnt bta btb btc bte btg bti btn btt c-- caa cab cac cae cag cai can cat cba cbb cbc cbe cbg cbi cbn cbt cca ccb ccc cce ccg cci ccn cct ce- cea ceb cec cee ceg cei cen cet cga cgb cgc cge cgg cgi cgn cgt ci- cia cib cic cie cig cii cin cit cn- cna cnb cnc cne cng cni cnn cnt cta ctb ctc cte ctg cti ctn ctt eaa eab eac eae eag eai ean eat eba ebb ebc ebe ebg ebi ebn ebt ec- eca ecb ecc ece ecg eci ecn ect eea eeb eec eee eeg een eet ega egb egc ege egg egi egn egt eia eib eic eie eig eii ein eit en- ena enb enc ene eng eni enn ent eta etb etc ete etg eti etn ett gaa gab gac gae gag gai gan gat gba gbc gbe gbg gbi gbn gbt gca gcb gcc gce gcg gci gcn gct ge- gea geb gec gee geg gei gen get gga ggb ggc ggg ggi ggn ggt gia gib gic gie gig gii gin git gna gnb gnc gne gni gnn gnt gta gtb gtc gte gtg gti gtn gtt ia- iaa iab iac iae iag iai ian iat iba ibb ibc ibe ibg ibi ibn ibt ica icb icc ice icg ici icn ict ie- iea iec iee ieg iei ien iet iga igb igc ige igg igi ign igt iia iib iic iie iii iin iit in- ina inb inc ine ing ini inn int ita itb itc ite itg iti itn itt n-i naa nab nac nae nag nai nan nat nba nbb nbc nbe nbg nbi nbn nbt nca ncb ncc nce ncg nci ncn nct ne- nea neb nec nee neg nei nen net nga ngb ngc nge ngg ngi ngn ngt nia nib nic nie nig nii nin nit nna nnb nnc nne nng nni nnn nnt nta ntb ntc nte ntg nti ntn ntt taa tab tac tae tag tai tan tat tba tbb tbc tbe tbg tbi tbn tbt tca tcb tcc tce tcg tci tcn tct te- tea teb tec tee teg tei ten tet tga tgb tgc tge tgg tgi tgn tgt tia tib tic tie tig tii tin tit tna tnb tnc tne tng tni tnn tnt tta ttb ttc tte ttg tti ttn ttt