a-a a-b a-c aaa aab aac aad aae aas aau ab- aba abb abc abd abe abs abu ac- aca acb acc acd ace acs acu ad- ada adb adc add ade ads adu aea aeb aec aed aee aes aeu as- asa asb asc asd ase ass asu au- aua aub auc aud aue aus b-u baa bab bac bad bae bas bau bba bbb bbc bbd bbe bbs bbu bca bcb bcc bcd bce bcs bcu bda bdb bdc bdd bde bds bdu be- bea beb bec bed bee bes beu bsa bsb bsc bsd bse bss bsu bua bub buc bud bue bus buu c-- caa cab cac cad cae cas cau cba cbb cbc cbd cbe cbs cbu cca ccb ccc ccd cce ccs ccu cda cdb cdc cdd cde cds cdu ce- cea ceb cec ced cee ces ceu csa csb csc csd cse css csu cua cub cuc cud cue cus cuu daa dab dac dad dae das dau dba dbb dbc dbd dbe dbs dbu dca dcb dcc dcd dce dcs dcu dda ddb ddc ddd dde dds ddu de- dea deb dec ded dee des deu dsa dsb dsc dsd dse dss dsu dua dub duc dud due dus eaa eab eac ead eae eas eau eba ebb ebc ebd ebe ebs ebu ec- eca ecb ecc ecd ece ecs ecu ed- eda edb edc edd ede eds edu eea eeb eec eed eee ees es- esa esb esc esd ese ess esu eu- eua eub euc eud eue eus saa sab sac sad sae sas sau sba sbb sbc sbd sbe sbs sbu sca scb scc scd sce scs scu sda sdb sdc sdd sde sds sdu se- sea seb sec sed see ses seu ss- ssa ssb ssc ssd sse sss ssu sua sub suc sud sue sus suu ua- uaa uab uac uad uae uas uau uba ubb ubc ube ubs ubu uca ucb ucc ucd uce ucs ucu uda udb udc udd ude uds udu uea ueb uec ued uee ues usa usb usc usd use uss usu uua uuc uue uus uuu