a-a a-c aaa aac aaf aap aas ac- aca acc acf acp acs af- afa afc aff afp afs ap- apa apc apf app aps as- asa asc asf asp ass c-- caa cac caf cap cas cca ccc ccf ccp ccs cfa cfc cff cfp cfs cpa cpc cpf cpp cps csa csc csf csp css faa fac faf fap fas fca fcc fcf fcp fcs ffa ffc fff ffp ffs fpa fpc fpp fps fsa fsc fsf fsp fss p-p paa pac paf pap pas pca pcc pcf pcp pcs pfa pfc pff pfp pfs ppa ppc ppf ppp pps ps- psa psc psf psp pss saa sac saf sap sas sca scc scf scp scs sfa sfc sff sfp sfs spa spc spf spp sps ss- ssa ssc ssf ssp sss