bbbb bbbq bbeb bbrc bcbc bccc bcec bcer bcru bcuc bebb bebe becu beeb beer berc bere berr beru beur bque brcb brce breb brec bree brer brrr bruc brue bubb bube bubq bubu bucc buce bucu buer bueu bur- burb bure burr buru cbbc cbcc cbce cbcr cbcu cbec cbee cber cbre ccbc cccb cccc cccu ccee ccrc ccre ccuc cebu cec- cece ceeb ceec cer- cerc cere crbc crbu crcc crce crcr cre- creb crec cree creu crub crue cub- cubb cube cucc cuce cucq cuer curb cure curr ebbc ebbr ebcc eber ebru ebur ecbc ecbe eccb eccc ecce ecrc ecrr ecru eeee eerc equ- eque erbb erbe ercc erce ereb erec erer errc erre erub eruc erur eubc euer eur- eurc eure q-be qcue qere qerq qqqq qube qucu quee quer quu- rbbb rbbr rcbc rccb rccc rebb rebe rebu recc rece recr recu reeb rere reru reue reuu rrrr rubb rube rubu ruce ruer rurc rure ruru ubbe uber ucbc ucrc uqcc urbe ure- urre uruq urur uuuu