a-a a-b a-i a-t aaa aab aag aai aao aas aat aau ab- aba abb abg abi abo abs abt abu ag- aga agb agg agi ago ags agt agu ai- aia aib aig aii aio ais ait aiu aoa aob aog aoi aoo aos aot aou as- asa asb asg asi aso ass ast asu at- ata atb atg ati ato ats att atu au- aua aub aug aui auo aus aut b-u baa bab bag bai bao bas bat bau bba bbb bbg bbi bbo bbs bbt bbu bga bgb bgg bgi bgo bgs bgt bgu bi- bia bib big bii bio bis bit biu boa bob bog boi boo bos bot bou bsa bsb bsg bsi bso bss bst bsu bta btb btg bti bto bts btt btu bua bub bug bui buo bus but buu gaa gab gag gai gao gas gat gau gba gbg gbi gbo gbs gbt gbu gga ggb ggg ggi ggo ggs ggt ggu gia gib gig gii gio gis git giu goa gob gog goi goo gos got gou gsa gsb gsg gsi gso gss gst gsu gta gtb gtg gti gto gts gtt gtu gu- gua gub gug gui guo gus gut guu ia- iaa iab iag iai iao ias iat iau iba ibb ibg ibi ibo ibs ibt ibu iga igb igg igi igo igs igt igu iia iib iii iio iis iit iiu io- ioa iob iog ioi ioo ios iot iou is- isa isb isg isi iso iss ist isu ita itb itg iti ito its itt itu iu- iua iub iug iui ius iut o-i oaa oab oag oai oao oas oat oau ob- oba obb obg obi obo obs obt obu oga ogg ogi ogo ogs ogt oia oib oii oio ois oit oiu oo- ooa oob oog ooi ooo oos oot os- osa osb osg osi oso oss ost osu ot- ota otb otg oti oto ots ott otu ou- oua oui ouo ous out saa sab sag sai sao sas sat sau sba sbb sbg sbi sbo sbs sbt sbu sga sgb sgg sgi sgo sgs sgt sgu sia sib sig sii sio sis sit siu soa sob sog soi soo sos sot sou ss- ssa ssb ssg ssi sso sss sst ssu sta stb stg sti sto sts stt stu sua sub sug sui suo sus sut suu taa tab tag tai tao tas tat tau tba tbb tbg tbi tbo tbs tbt tbu tga tgb tgg tgi tgo tgs tgt tgu tia tib tig tii tio tis tit tiu to- toa tob tog toi too tos tot tou tsa tsb tsg tsi tso tss tst tsu tta ttb ttg tti tto tts ttt ttu tua tub tug tui tuo tus tut tuu ua- uaa uab uag uai uao uas uat uau uba ubb ubg ubi ubo ubs ubt ubu uga ugb ugg ugi ugo ugs ugt ugu uia uib uig uii uio uis uit uiu uoa uob uog uoo uos uot usa usb usg usi uso uss ust usu uta utb uti uto uts utt utu uua uug uus uut uuu