a-a a-b a-c a-t aaa aab aac aad aao aas aat aau ab- aba abb abc abd abo abs abt abu ac- aca acb acc acd aco acs act acu ad- ada adb adc add ado ads adt adu aoa aob aoc aod aoo aos aot aou as- asa asb asc asd aso ass ast asu at- ata atb atc atd ato ats att atu au- aua aub auc aud auo aus aut b-u baa bab bac bad bao bas bat bau bba bbb bbc bbd bbo bbs bbt bbu bca bcb bcc bcd bco bcs bct bcu bda bdb bdc bdd bdo bds bdt bdu boa bob boc bod boo bos bot bou bsa bsb bsc bsd bso bss bst bsu bta btb btc btd bto bts btt btu bua bub buc bud buo bus but buu c-- caa cab cac cad cao cas cat cau cba cbb cbc cbd cbo cbs cbt cbu cca ccb ccc ccd cco ccs cct ccu cda cdb cdc cdd cdo cds cdt cdu co- coa cob coc cod coo cos cot cou csa csb csc csd cso css cst csu cta ctb ctc ctd cto cts ctt ctu cua cub cuc cud cuo cus cut cuu daa dab dac dad dao das dat dau dba dbb dbc dbd dbo dbs dbt dbu dca dcb dcc dcd dco dcs dct dcu dda ddb ddc ddd ddo dds ddt ddu doa dob doc dod doo dos dot dou dsa dsb dsc dsd dso dss dst dsu dta dtb dtc dtd dto dts dtt dtu dua dub duc dud duo dus dut oaa oab oac oad oao oas oat oau ob- oba obb obc obd obo obs obt obu oc- oca ocb occ ocd oco ocs oct ocu oda odb odc odd odo ods odt odu oo- ooa oob ooc ood ooo oos oot os- osa osb osc osd oso oss ost osu ot- ota otb otc otd oto ots ott otu ou- oua ouc oud ouo ous out saa sab sac sad sao sas sat sau sba sbb sbc sbd sbo sbs sbt sbu sca scb scc scd sco scs sct scu sda sdb sdc sdd sdo sds sdt sdu soa sob soc sod soo sos sot sou ss- ssa ssb ssc ssd sso sss sst ssu sta stb stc std sto sts stt stu sua sub suc sud suo sus sut suu taa tab tac tad tao tas tat tau tba tbb tbc tbd tbo tbs tbt tbu tca tcb tcc tcd tco tcs tct tcu tda tdb tdc tdd tdo tds tdt tdu to- toa tob toc tod too tos tot tou tsa tsb tsc tsd tso tss tst tsu tta ttb ttc ttd tto tts ttt ttu tua tub tuc tud tuo tus tut tuu ua- uaa uab uac uad uao uas uat uau uba ubb ubc ubo ubs ubt ubu uca ucb ucc ucd uco ucs uct ucu uda udb udc udd udo uds udt udu uoa uob uoc uod uoo uos uot usa usb usc usd uso uss ust usu uta utb utc utd uto uts utt utu uua uuc uus uut uuu