bbbb bbdd bbdo bblb bcbc bccc bccl bctc bdbc bddc blbt bldc blob bloc blod bloo blot bobb bobo boco bodb bodo bold boll bolo bolt boob booc bood bool boot botb botd boto bott btcc btcl btdt btob bttb c-bo c-cd cbbc cbcc cbcl cbct cbdb cbdc cbdo cblb cblc cbol cbot cbtc cbtl ccbc cccb cccc cccl ccdc cclc ccob ccoc ccod cctb cctc cctl cctt cddb cddl cdot clcd cldc clob clod cloo clot cltb cltc cobb cobo coco coct codd codl col- colb cold coll colo colt coob cood cool coot cotb cotc coto cott ctol ctot d-bo dbcc dbtt dcbc dccb dccc dccl dcct dcdb dctc dddd ddlc ddoc ddot dlbd dlco dobb dobl doco doct dod- dodd dodo dold doll dolo dolt doob dood dool doot dotd doto dott dtcc dtot lbcc lcbc lccc lcdd lctl lcto llcc lldb lldc lllc llll lloc llod lloo lob- lobb lobo locc loco lold loll lolo loob looc lood lool loot lotd lotl loto lott ltbl ltcc lttc obbo obdt obol obot obtd ocbc occc occt oclc oct- octo odbo oddd odoo odot olbo olcc oldb ollo olot oold oolo oooo ootb otbd otcd otcl oto- otoo otto tbcb tbcc tbcd tccc tcdd tctc tddb tlco tobo tobt toco todd todo todt tol- told toll tolo tolt tood tool toot totc totd toto tott ttbb tttt