a-a a-b a-t aaa aab aae aao aas aat aau ab- aba abb abe abo abs abt abu aea aeb aee aeo aes aet aeu aoa aob aoe aoo aos aot aou as- asa asb ase aso ass ast asu at- ata atb ate ato ats att atu au- aua aub aue auo aus aut b-u baa bab bae bao bas bat bau bba bbb bbe bbo bbs bbt bbu be- bea beb bee beo bes bet beu boa bob boe boo bos bot bou bsa bsb bse bso bss bst bsu bta btb bte bto bts btt btu bua bub bue buo bus but buu eaa eab eae eao eas eat eau eba ebb ebe ebo ebs ebt ebu eea eeb eee eeo ees eet eo- eoa eob eoe eoo eos eot eou es- esa esb ese eso ess est esu eta etb ete eto ets ett etu eu- eua eub eue eus eut oaa oab oae oao oas oat oau ob- oba obb obe obo obs obt obu oea oeb oee oeo oes oet oo- ooa oob ooo oos oot os- osa osb ose oso oss ost osu ot- ota otb ote oto ots ott otu ou- oua oue ouo ous out saa sab sae sao sas sat sau sba sbb sbe sbo sbs sbt sbu se- sea seb see seo ses set seu soa sob soe soo sos sot sou ss- ssa ssb sse sso sss sst ssu sta stb ste sto sts stt stu sua sub sue suo sus sut suu taa tab tae tao tas tat tau tba tbb tbe tbo tbs tbt tbu te- tea teb tee teo tes tet teu to- toa tob toe too tos tot tou tsa tsb tse tso tss tst tsu tta ttb tte tto tts ttt ttu tua tub tue tuo tus tut tuu ua- uaa uab uae uao uas uat uau uba ubb ube ubo ubs ubt ubu uea ueb uee ues uet uoa uob uoe uoo uos uot usa usb use uso uss ust usu uta utb ute uto uts utt utu uua uue uus uut uuu