-ic a-a a-b a-c a-i a-t aaa aab aac aae aag aai aan aao aat ab- aba abb abc abe abg abi abn abo abt ac- aca acb acc ace acg aci acn aco act aea aeb aec aee aeg aei aen aeo aet ag- aga agb agc age agg agi agn ago agt ai- aia aib aic aie aig aii ain aio ait an- ana anb anc ane ang ani ann ano ant aoa aob aoc aoe aog aoi aon aoo aot at- ata atb atc ate atg ati atn ato att baa bab bac bae bag bai ban bao bat bba bbb bbc bbe bbg bbi bbn bbo bbt bca bcb bcc bce bcg bci bcn bco bct be- bea beb bec bee beg bei ben beo bet bga bgb bgc bge bgg bgi bgn bgo bgt bi- bia bib bic bie big bii bin bio bit bna bnb bnc bne bng bni bnn bno bnt boa bob boc boe bog boi bon boo bot bta btb btc bte btg bti btn bto btt c-- caa cab cac cae cag cai can cao cat cba cbb cbc cbe cbg cbi cbn cbo cbt cca ccb ccc cce ccg cci ccn cco cct ce- cea ceb cec cee ceg cei cen ceo cet cga cgb cgc cge cgg cgi cgn cgo cgt ci- cia cib cic cie cig cii cin cio cit cn- cna cnb cnc cne cng cni cnn cno cnt co- coa cob coc coe cog coi con coo cot cta ctb ctc cte ctg cti ctn cto ctt eaa eab eac eae eag eai ean eao eat eba ebb ebc ebe ebg ebi ebn ebo ebt ec- eca ecb ecc ece ecg eci ecn eco ect eea eeb eec eee eeg een eeo eet ega egb egc ege egg egi egn ego egt eia eib eic eie eig eii ein eio eit en- ena enb enc ene eng eni enn eno ent eo- eoa eob eoc eoe eog eoi eon eoo eot eta etb etc ete etg eti etn eto ett gaa gab gac gae gag gai gan gao gat gba gbc gbe gbg gbi gbn gbo gbt gca gcb gcc gce gcg gci gcn gco gct ge- gea geb gec gee geg gei gen geo get gga ggb ggc ggg ggi ggn ggo ggt gia gib gic gie gig gii gin gio git gna gnb gnc gne gni gnn gno gnt goa gob goc goe gog goi gon goo got gta gtb gtc gte gtg gti gtn gto gtt ia- iaa iab iac iae iag iai ian iao iat iba ibb ibc ibe ibg ibi ibn ibo ibt ica icb icc ice icg ici icn ico ict ie- iea iec iee ieg iei ien iet iga igb igc ige igg igi ign igo igt iia iib iic iie iii iin iio iit in- ina inb inc ine ing ini inn ino int io- ioa iob ioc ioe iog ioi ion ioo iot ita itb itc ite itg iti itn ito itt n-i naa nab nac nae nag nai nan nao nat nba nbb nbc nbe nbg nbi nbn nbo nbt nca ncb ncc nce ncg nci ncn nco nct ne- nea neb nec nee neg nei nen neo net nga ngb ngc nge ngg ngi ngn ngo ngt nia nib nic nie nig nii nin nio nit nna nnb nnc nne nng nni nnn nno nnt no- noa nob noc noe nog noi non noo not nta ntb ntc nte ntg nti ntn nto ntt o-i oaa oab oac oae oag oai oan oao oat ob- oba obb obc obe obg obi obn obo obt oc- oca ocb occ ocg oci ocn oco oct oea oeb oec oee oeg oei oen oeo oet oga ogc oge ogg ogi ogn ogo ogt oia oib oic oie oii oin oio oit on- ona onb onc one ong oni onn ono ont oo- ooa oob ooc oog ooi oon ooo oot ot- ota otb otc ote otg oti otn oto ott taa tab tac tae tag tai tan tao tat tba tbb tbc tbe tbg tbi tbn tbo tbt tca tcb tcc tce tcg tci tcn tco tct te- tea teb tec tee teg tei ten teo tet tga tgb tgc tge tgg tgi tgn tgo tgt tia tib tic tie tig tii tin tio tit tna tnb tnc tne tng tni tnn tno tnt to- toa tob toc toe tog toi ton too tot tta ttb ttc tte ttg tti ttn tto ttt