a-a a-b a-c aaa aab aac aad aae aao aau ab- aba abb abc abd abe abo abu ac- aca acb acc acd ace aco acu ad- ada adb adc add ade ado adu aea aeb aec aed aee aeo aeu aoa aob aoc aod aoe aoo aou au- aua aub auc aud aue auo b-u baa bab bac bad bae bao bau bba bbb bbc bbd bbe bbo bbu bca bcb bcc bcd bce bco bcu bda bdb bdc bdd bde bdo bdu be- bea beb bec bed bee beo beu boa bob boc bod boe boo bou bua bub buc bud bue buo buu c-- caa cab cac cad cae cao cau cba cbb cbc cbd cbe cbo cbu cca ccb ccc ccd cce cco ccu cda cdb cdc cdd cde cdo cdu ce- cea ceb cec ced cee ceo ceu co- coa cob coc cod coe coo cou cua cub cuc cud cue cuo cuu daa dab dac dad dae dao dau dba dbb dbc dbd dbe dbo dbu dca dcb dcc dcd dce dco dcu dda ddb ddc ddd dde ddo ddu de- dea deb dec ded dee deo deu doa dob doc dod doe doo dou dua dub duc dud due duo eaa eab eac ead eae eao eau eba ebb ebc ebd ebe ebo ebu ec- eca ecb ecc ecd ece eco ecu ed- eda edb edc edd ede edo edu eea eeb eec eed eee eeo eo- eoa eob eoc eod eoe eoo eou eu- eua eub euc eud eue oaa oab oac oad oae oao oau ob- oba obb obc obd obe obo obu oc- oca ocb occ ocd oco ocu oda odb odc odd ode odo odu oea oeb oec oed oee oeo oo- ooa oob ooc ood ooo ou- oua ouc oud oue ouo ua- uaa uab uac uad uae uao uau uba ubb ubc ube ubo ubu uca ucb ucc ucd uce uco ucu uda udb udc udd ude udo udu uea ueb uec ued uee uoa uob uoc uod uoe uoo uua uuc uue uuu