bbbb bbci bbrc bcbc bccc bcci bcit bctc bibb bibi bicc bici birb biri birr birt bitc bitt bivi brcb bric brit brrr brtc brvi btcc btrc btrt bttb btvi cbbc cbcc cbcr cbct cbir cbit cbrt cbtc cbtv cbvb cbvr ccbc cccb cccc ccci cccv ccic ccii ccir cciv ccrc ccri ccrt cctb cctc cctt cctv ccvi cibc cibi cicc cici cicr cict ciii ciit cirb circ ciri cirr cirt citb citi citt citv civc crbc crcc crcr crib cric crit crrt crtc crtv ctbi ctic ctrc ctvt cvcc cvii cvrr ibrc ibri ibtb ibtc icbc iccb iccc icci iccr icct icrc icrr icrt ictv iiii iiit iirc iitr iitt ircc iri- iric irrc irri irti itic itri ivbv ivic rbbb rbbr rcbc rccb rccc rcic rctc rcti rctv rcvr rib- ricc rict riri riti ritt rrrr rtcc rtvi rv-c tbcb tbcc tbit tbrb tbvi tccc tctc tibi ticc tiit tirb tiri tirr titc titi titt tivi trcc tri- trib tric trit trtc trtr ttbb tttt tvri tvrr tvtv vbcc vcbi vcci vic- vici vict viii virb virc viri virr virt viti vitt vivi vrci vt-i vvvv