bbbb bbci bbrc bbrg bcbc bcbg bccc bcci bcor bcvo bibb bibi bibo bicc bicg bici bico bigb bigc bigg bigo bio- bioc biog bioi birb birg biri biro birr bivi bobb bobi bobo boco bogg bogi bogo boi- boii boob booc boog boor bor- borg bori boro borr bovi bovo brcb bric brig brio brob broc brog broo bror brrr brvi c-bo cbbc cbcc cbcr cbgb cbir cbvb cbvg cbvr ccbc cccb cccc ccci cccv ccgc ccic ccii ccir cciv ccob ccoc ccrc ccrg ccri ccvi ccvo cgcc cgcg cgro cibc cibi cibo cicc cici cico cicr cigi ciii ciob cior cirb circ ciri ciro cirr civc civo cobb cobi cobo coco cogi cogo coir coob cor- corb corc corg cori coro corr covo crbc crcc crcr crib cric crig crob croc croo cror cvcc cvii cvrg cvrr gbbo gc-c gcbc gccc gcic gcii gciv gcov gcrg gggg gibb gicr gigg gigi gigo giog gioi girg giri giro girr gobi gobo gocr gogi gogo goog gooi goor gorb gorg gori goro gorr govi grbr grcc grib gric grig grob groc grog groi groo gror grov grrr gvvv i-go ibrc ibri ibro icbc iccb iccc icci icco iccr icgc icoc icor icrc icrr igbc igbo igcc igoo igor igri iiii iiio iioi iioo iirc iobi iocg ioci ioii ioio iooi iooo iorg iori ircc ircg iri- iric irig irio irob iroc irov irrc irri ivbv ivic ivig ivor obbo oboi obor obri obro obvi ocbc occc occi ocro ocrr ogb oggi ogog ogoi ogri ogro oici oigo oiii oobi oocr oooo orbb orbi orbo orci orco orgo ori- oric orig orio oro- oror orri orro orvr ovi- ovo- ovoo rbbb rbbr rcbc rcbo rccb rccc rcgc rcic rcrg rcvr rgbi rib- ribo ricc rico rigg rigi rigo riri rivo rob- robb robi robo rocc roco rogg rogi rogo roig roio roir roob roog rooi roor rorc rori roro rovi rovo rrrr rv-c vbcc vbrg vcbi vcci vgcc vic- vici vico vigo vigr viii virb virc virg viri viro virr vivi vivo voic voio voir vooc voog voor vor- vori voro vrci vrio vroc vvob vvog vvvv