bbbb bblb bcbc bcbp bccc bccl bcpl bcpp blob bloc bloo blop bobb bobo boco boll bolo boob booc bool boop bopp bpcp c-bo cbbc cbcc cbcl cbcp cblb cblc cbol cbpc cbpp ccbc cccb cccc cccl cccp cclc ccob ccoc ccpl ccpp clob cloo clop clpb clpp cobb cobo coco cocp col- colb coll colo colp coob cool coop copo copp cpbc cplc lbcc lcbc lccc lcpc lcpl llcc lllc llll lloc lloo lob- lobb lobo locc loco loll lolo loob looc lool loop lopp lppl obbo obol ocbc occc oclc ocpp olbo olcc ollo olpc oolo oooo opo- oppo pbcc pboc pcbc pccc pccl pcll pclo pcpb pcpp plcc plob ploc ploo plop plpp pobo poco poll polo pool poop pop- popc popo popp ppcc pplo pppo pppp