bbbb bbbs bcbc bcbs bccc bccs bcos bcsc bcsn bcss bctc bcts bnoc bnss bobb bobo bobs boco bocs bonc bonn bono bons bont boob booc boon boos boot bosc bosn boso boss bost botb botn boto bots bott bscs bsns bson bsos bssc bsts btcc btcs btob btss bttb c-bo cbbc cbbs cbcc cbcn cbcs cbct cbot cbsc cbsn cbtc ccbc ccbn cccb cccc cccs ccnb ccnc ccns ccob ccoc ccsn ccss ccst cctb cctc cctt cnbc cnco cnss cntc cobb cobo cobs coco coct con- conc conn cono cons cont coob coon coos coot cosc coso coss cost cotb cotc cotn coto cots cott cscb cscc csco cscs csob csos csot cstc csto csts ctbs ctns ctos ctot ctsc ctsn ctss cttn ctts nbbc nbbo nbcc nbco nbcs ncbc ncbs nccc nccn nccs ncct ncnc ncoc ncos ncsc ncss ncst nctc nnnn nnos nnot nnss nntn nobc nobo nobs noco nocs noct non- nonn nono nons nont noo- noob noon nooo noos noot nos- noss nost not- noto nots nott nsbo nscc nscs nsos nssb nssc nsso nsss nstc nsts ntbc ntcc ntsb ntsc ntss ntto obbo obon obos obot obsn obss obst obts ocbc occc occn occt ocon ocos oct- octo octs onc- onco onct onno onon onos onsc onso onst ont- ontc onto oons oont oooo ooos oost ootb oots oscc osco osno osoo osos ossb osso ostc osts otbs oto- oton otoo otos otso otto otts s-os sbbs sbcc sbcs sbct sbot sbst sbtc sbtn sccc sccs scct scnt scob scon scoo scot scsc scsn scso scst sctc sctn scto scts sncc snco snns snob snoc snoo snos snot sobo sobs sobt soco socs son- sono sons sont soon soos soot soso soss sost sotc sotn soto sots ssbn sscc sscs ssns ssoc ssot sssb sssc ssss sstb sstc ssts stbc stbs stcc stcs stnn stns stob ston stoo stos stot stss sttc tbbs tbcb tbcc tbst tcbs tccc tcnn tcon tcos tctc tcts tnbc tncc tnts tobo tobs tobt toco tonb tonn tono tons toon toos toot tosb tosc toso toss tost totc toto tots tott tsbc tscc tsob tsos tsst tstc tsts ttbb ttcn tton ttss tttt