bbbb bbci bbin bcbc bccc bcci bcit bctc bibb bibi bicc bici biin bin- binc bini binn bint bitc bitt bnib bnin btcc bttb cbbc cbcc cbcn cbct cbit cbtc ccbc ccbn cccb cccc ccci ccic ccii ccnb ccnc ccni cctb cctc cctt cibc cibi cicc cici cict ciii ciit cin- cinc cini cint citb citi citt cnbc cnci cnib cnic cntc ctbi ctic cttn ibtb ibtc icbc iccb iccc icci iccn icct icnb icnc iiii iiit iitt incb inci init inni inti intn itic itin n-ii nbbc nbcc nbci nbic nbti ncbc ncbi nccc ncci nccn ncct ncit ncnc nctc nibi nicc nici niit nini nitb nitc niti nnit nnnn nntn ntbc ntcc tbcb tbcc tbit tccc tcnn tctc tibi ticc tiit tinc tini tinn tint titc titi titt tnbc tncc ttbb ttcn tttt