bbbb bbeb bbet bbfc bcbc bccc bcec bcet bcfc bctc bcuc bebb bebe becu beeb beef beet befe beff beft betc bete bett betu bftt btcc btec btfc bttb bubb bube bubu bucc buce bucu bueu bufc bufe buff but- bute butt cbbc cbcc cbce cbct cbcu cbec cbee cbef cbet cbfb cbfc cbtc cbtf ccbc cccb cccc cccf cccu ccee ccfc ccff cctb cctc cctt ccuc ccut cebu cec- cece cect ceeb ceec cef- cefc cet- cete cfbc cfbt cfcb cfcf cffb cftc cfte ctcf ctec ctfc cub- cubb cube cucc cuce cufc cuff cut- cutc cute cutt ebbc ebcc ebfc ecbc ecbe eccb eccc ecce ecct ecef ecfc ect- ectc ectf eeee eefe eetc eete eetu efet eft- eftu etbc etcc etec etee etfb etfc etfe ette ettu eubc eufc fccf fece fect feeb feet fefc fefe feff fete fett fetu ffcc ffee ffff fftf ft-c ftfc ftub ftuc fubb fubu fuc- fuct fuet fufc fuff fufu fute futu tbcb tbcc tbce tccc tccu tcfc tctc tebu tect teec teef teet tefc teff teft tete tett tetu teut tfcu tfeb tfec tftc ttbb ttfc ttff tttt tubb tube tubu tucc tuet tufc tufe tuff tuft tufu tute tutt tutu ubbe ubet ubtf ucbc ucfb ucut ufcu uffe utec uttu uutf uuuu