cccc cccl cccp cclc ccoc ccpl ccpp cctc cctl cctt cloo clop clot clpp cltc coco cocp coct col- coll colo colp colt cool coop coot copo copp copt cotc coto cott cplc cptp ctcp ctol ctot ctpo ctpp lccc lcpc lcpl lctl lcto llcc lllc llll lloc lloo locc loco loll lolo looc lool loop loot lopp lotl loto lott lppl ltcc lttc occc occt oclc ocpp oct- octo olcc ollo olot olpc oolo oooo ootp opo- oppo opto otcl oto- otoo otpp otto pccc pccl pcll pclo pcpp plcc ploc ploo plop plot plpp pltt poco poll polo polt pool poop poot pop- popc popo popp popt potc poto pott ppcc pplo pppo pppp pptt ptcc ptcl ptol ptop pttc tccc tcpo tctc tlco toco tol- toll tolo tolt tool toot top- topo topp topt totc toto tott tpcp tpol tppp tptp ttcp ttop tttt