bbbb bbci bbeb bbet bcbc bccc bcci bcec bcet bcie bcit bctc bebb bebe bebi beci beeb beet beic beit betc bete beti bett bibb bibe bibi bicc bice bici bieb biet bitc bite bitt btcc btec btie bttb cbbc cbcc cbce cbct cbec cbee cbet cbit cbtc ccbc cccb cccc ccci ccee ccic ccii cctb cctc cctt cec- cece ceci cect ceeb ceec cet- cete ceti cibc cibe cibi cicc cici cict ciee ciii ciit citb cite citi citt ctbi ctec ctic ebbc ebcc ebic ebit ecbc ecbe eccb eccc ecce ecci ecct ecib ecit ect- ectc eeee eetc eete eiec eiei eitb eitc eiti etbc etcc etec etee etic ette etti i-be ibec ibet ibie ibtb ibtc icbc iccb iccc icci icct icec icee icet iecc ieet ieie iett iiie iiii iiit iitt itbe itec itet itic itie tbcb tbcc tbce tbit tccc tctc tect teec teet teic teie tete teti tett tibi ticc tice tie- tiee tiei tiet tiit titc tite titi titt ttbb tttt