-ic a-a a-b a-c a-i a-t aaa aab aac aag aai aao aas aat ab- aba abb abc abg abi abo abs abt ac- aca acb acc acg aci aco acs act ag- aga agb agc agg agi ago ags agt ai- aia aib aic aig aii aio ais ait aoa aob aoc aog aoi aoo aos aot as- asa asb asc asg asi aso ass ast at- ata atb atc atg ati ato ats att baa bab bac bag bai bao bas bat bba bbb bbc bbg bbi bbo bbs bbt bca bcb bcc bcg bci bco bcs bct bga bgb bgc bgg bgi bgo bgs bgt bi- bia bib bic big bii bio bis bit boa bob boc bog boi boo bos bot bsa bsb bsc bsg bsi bso bss bst bta btb btc btg bti bto bts btt c-- caa cab cac cag cai cao cas cat cba cbb cbc cbg cbi cbo cbs cbt cca ccb ccc ccg cci cco ccs cct cga cgb cgc cgg cgi cgo cgs cgt ci- cia cib cic cig cii cio cis cit co- coa cob coc cog coi coo cos cot csa csb csc csg csi cso css cst cta ctb ctc ctg cti cto cts ctt gaa gab gac gag gai gao gas gat gba gbc gbg gbi gbo gbs gbt gca gcb gcc gcg gci gco gcs gct gga ggb ggc ggg ggi ggo ggs ggt gia gib gic gig gii gio gis git goa gob goc gog goi goo gos got gsa gsb gsc gsg gsi gso gss gst gta gtb gtc gtg gti gto gts gtt ia- iaa iab iac iag iai iao ias iat iba ibb ibc ibg ibi ibo ibs ibt ica icb icc icg ici ico ics ict iga igb igc igg igi igo igs igt iia iib iic iii iio iis iit io- ioa iob ioc iog ioi ioo ios iot is- isa isb isc isg isi iso iss ist ita itb itc itg iti ito its itt o-i oaa oab oac oag oai oao oas oat ob- oba obb obc obg obi obo obs obt oc- oca ocb occ ocg oci oco ocs oct oga ogc ogg ogi ogo ogs ogt oia oib oic oii oio ois oit oo- ooa oob ooc oog ooi ooo oos oot os- osa osb osc osg osi oso oss ost ot- ota otb otc otg oti oto ots ott saa sab sac sag sai sao sas sat sba sbb sbc sbg sbi sbo sbs sbt sca scb scc scg sci sco scs sct sga sgb sgc sgg sgi sgo sgs sgt sia sib sic sig sii sio sis sit soa sob soc sog soi soo sos sot ss- ssa ssb ssc ssg ssi sso sss sst sta stb stc stg sti sto sts stt taa tab tac tag tai tao tas tat tba tbb tbc tbg tbi tbo tbs tbt tca tcb tcc tcg tci tco tcs tct tga tgb tgc tgg tgi tgo tgs tgt tia tib tic tig tii tio tis tit to- toa tob toc tog toi too tos tot tsa tsb tsc tsg tsi tso tss tst tta ttb ttc ttg tti tto tts ttt