c-- ccc ccf ccp ccs cfc cff cfp cfs cpc cpf cpp cps csc csf csp css csy cyc cyf cyp cys fcc fcf fcp fcs fcy ffc fff ffp ffs ffy fpc fpp fps fpy fsc fsf fsp fss fy- fyc fyp p-p pcc pcf pcp pcs pfc pff pfp pfs pfy ppc ppf ppp pps ps- psc psf psp pss psy py- pyc pyf pys scc scf scp scs sfc sff sfp sfs spc spf spp sps spy ss- ssc ssf ssp sss sy- syc syp sys ycc ycf ycp ycs ycy yfc yff yfs ypf yps ysc ysp yss ysy yyc yyf yys yyy