aaaa aaac aaaf aaap aaca aacc aacf aaco aacp aafa aafc aaff aaoo aapa aapc aapo acaa acac acap acca accc accf acco accp acfc acoa acop acpa afaa afao afap afca afcc affa affc affo afoa afoo afpa afpc aoca aopo apac apao apap apca apcc apco apfa apfc apfo apo- apoc apof apoo apop appa appc caaa caac caaf caap cac- caca cacc caco cafa cafc caff capa capc capo capp ccaa ccac ccaf ccap ccca cccc cccf cccp ccfa ccfc ccff ccoc ccpa ccpp cfaa cfac cfao cfca cfcf cfco cfoa cfpa cfpo coca coco cocp cofc coff coof coop copa copo copp cpaa cpac cpaf cpap cpca cpff cppa faaa faac faap faca facc facp fafa fafc faff fafo fapa fapp fcap fcca fccf fccp fcpa ffcc ffff foaf foca foco fofo foof fopp fp-c fpaa fpcc oafc oafo ocac ocap occa occc ocfa ocfp ocpa ocpp off- offa offc offo ooaa ooff oooo opap opca opo- oppa oppo paap paca paco pafa pafc paff paoc papa papp pcaa pcaf pcap pcca pccc pcfc pcoa pcpp pfaa pfff poca poco poff poof poop pop- popa popc popo popp ppac ppap ppcc ppfa ppoa pppa pppo pppp