a-a a-c aaa aac aae aao aap aas ac- aca acc ace aco acp acs aea aec aee aeo aep aes aoa aoc aoe aoo aop aos ap- apa apc ape apo app aps as- asa asc ase aso asp ass c-- caa cac cae cao cap cas cca ccc cce cco ccp ccs ce- cea cec cee ceo cep ces co- coa coc coe coo cop cos cpa cpc cpe cpo cpp cps csa csc cse cso csp css eaa eac eae eao eap eas ec- eca ecc ece eco ecs eea eec eee eeo eep ees eo- eoa eoc eoe eoo eop eos ep- epa epc epe epo epp eps es- esa esc ese eso esp ess oaa oac oae oao oap oas oc- oca occ oco ocp ocs oea oec oee oeo oep oes oo- ooa ooc ooo oop oos op- opa opc ope opo opp ops os- osa osc ose oso osp oss p-p paa pac pae pao pap pas pca pcc pce pco pcp pcs pea pec pee peo pep pes poa poc poe poo pop pos ppa ppc ppe ppo ppp pps ps- psa psc pse pso psp pss saa sac sae sao sap sas sca scc sce sco scp scs se- sea sec see seo sep ses soa soc soe soo sop sos spa spc spe spo spp sps ss- ssa ssc sse sso ssp sss