bbbb bbrc bbrg bcbc bcbg bccc bcor bcru bcuc bobb bobo bobu boco bocu bogg bogo boob booc boog boor bor- borg boro borr boru bour brcb brob broc brog broo bror brou brrr bruc brug bubb bubo bubu bucc buco bucu bugg bugo bur- burb burg buro burr buru c-bo cbbc cbcc cbcr cbcu cbgb ccbc cccb cccc cccu ccgc ccob ccoc ccrc ccrg ccuc cgcc cgcg cgro cobb cobo cobu coco cocu cogo coob cor- corb corc corg coro corr coub cour crbc crbu crcc crcr crob croc croo cror crub crug cub- cubb cucc curb curo curr gbbo gc-c gcbc gccc gcrg gggg gobo gocr gogo goog goor gorb gorg goro gorr gou- goug gour grbr grcc grob groc grog groo gror grou grrr grub grug grur gubb gubu gugb gugg gugu gurb gurg guro gurr guru obbo obor obro ocbc occc ocro ocrr ocur ogb ogog ogou ogro oocr oooo orbb orbo orbu orco orgo oro- oror orro orub oucc our- ouro ouu- rbbb rbbr rcbc rcbo rccb rccc rcgc rcrg rob- robb robo robu rocc roco rogg rogo roob roog roor rorc roro roru roub rrrr rubb rubu rugg rurc ruro ruru ubbo uboc ucbc ucrc ugcc ugcg uggo ugro ugur uguu uocc uor- urgu uro- uroo urur uuoc uuuu