a-a a-b a-c aaa aab aac aae aao aas aau ab- aba abb abc abe abo abs abu ac- aca acb acc ace aco acs acu aea aeb aec aee aeo aes aeu aoa aob aoc aoe aoo aos aou as- asa asb asc ase aso ass asu au- aua aub auc aue auo aus b-u baa bab bac bae bao bas bau bba bbb bbc bbe bbo bbs bbu bca bcb bcc bce bco bcs bcu be- bea beb bec bee beo bes beu boa bob boc boe boo bos bou bsa bsb bsc bse bso bss bsu bua bub buc bue buo bus buu c-- caa cab cac cae cao cas cau cba cbb cbc cbe cbo cbs cbu cca ccb ccc cce cco ccs ccu ce- cea ceb cec cee ceo ces ceu co- coa cob coc coe coo cos cou csa csb csc cse cso css csu cua cub cuc cue cuo cus cuu eaa eab eac eae eao eas eau eba ebb ebc ebe ebo ebs ebu ec- eca ecb ecc ece eco ecs ecu eea eeb eec eee eeo ees eo- eoa eob eoc eoe eoo eos eou es- esa esb esc ese eso ess esu eu- eua eub euc eue eus oaa oab oac oae oao oas oau ob- oba obb obc obe obo obs obu oc- oca ocb occ oco ocs ocu oea oeb oec oee oeo oes oo- ooa oob ooc ooo oos os- osa osb osc ose oso oss osu ou- oua ouc oue ouo ous saa sab sac sae sao sas sau sba sbb sbc sbe sbo sbs sbu sca scb scc sce sco scs scu se- sea seb sec see seo ses seu soa sob soc soe soo sos sou ss- ssa ssb ssc sse sso sss ssu sua sub suc sue suo sus suu ua- uaa uab uac uae uao uas uau uba ubb ubc ube ubo ubs ubu uca ucb ucc uce uco ucs ucu uea ueb uec uee ues uoa uob uoc uoe uoo uos usa usb usc use uso uss usu uua uuc uue uus uuu