bbbb bbci bbrc bcbc bccc bcci bcor bcvo bibb bibi bibo bicc bici bico bio- bioc bioi birb biri biro birr bivi bobb bobi bobo boco boi- boii boob booc boor bor- bori boro borr bovi bovo brcb bric brio brob broc broo bror brrr brvi c-bo cbbc cbcc cbcr cbir cbvb cbvr ccbc cccb cccc ccci cccv ccic ccii ccir cciv ccob ccoc ccrc ccri ccvi ccvo cibc cibi cibo cicc cici cico cicr ciii ciob cior cirb circ ciri ciro cirr civc civo cobb cobi cobo coco coir coob cor- corb corc cori coro corr covo crbc crcc crcr crib cric crob croc croo cror cvcc cvii cvrr ibrc ibri ibro icbc iccb iccc icci icco iccr icoc icor icrc icrr iiii iiio iioi iioo iirc iobi ioci ioii ioio iooi iooo iori ircc iri- iric irio irob iroc irov irrc irri ivbv ivic ivor obbo oboi obor obri obro obvi ocbc occc occi ocro ocrr oici oiii oobi oocr oooo orbb orbi orbo orci orco ori- oric orio oro- oror orri orro orvr ovi- ovo- ovoo rbbb rbbr rcbc rcbo rccb rccc rcic rcvr rib- ribo ricc rico riri rivo rob- robb robi robo rocc roco roio roir roob rooi roor rorc rori roro rovi rovo rrrr rv-c vbcc vcbi vcci vic- vici vico viii virb virc viri viro virr vivi vivo voic voio voir vooc voor vor- vori voro vrci vrio vroc vvob vvvv