a-a a-c aaa aac aap aas aay ac- aca acc acp acs acy ap- apa apc app aps apy as- asa asc asp ass asy ay- aya ayc ayp ays c-- caa cac cap cas cay cca ccc ccp ccs cpa cpc cpp cps csa csc csp css csy cya cyc cyp cys p-p paa pac pap pas pay pca pcc pcp pcs ppa ppc ppp pps ps- psa psc psp pss psy py- pya pyc pys saa sac sap sas say sca scc scp scs spa spc spp sps spy ss- ssa ssc ssp sss sy- sya syc syp sys yaa yac yap yas yay yca ycc ycp ycs ycy ypa yps ysa ysc ysp yss ysy yyc yys yyy