a-a a-c aaa aac aaf aah aas ac- aca acc acf ach acs af- afa afc aff afh afs aha ahc ahf ahh ahs as- asa asc asf ash ass c-- caa cac caf cah cas cca ccc ccf cch ccs cfa cfc cff cfh cfs ch- cha chc chf chh chs csa csc csf csh css faa fac faf fah fas fca fcc fcf fcs ffa ffc fff ffh ffs fha fhc fhf fhh fhs fsa fsc fsf fsh fss haa hac haf hah has hca hcc hcf hch hcs hfa hfc hff hfh hfs hha hhc hhf hhh hhs hsa hsc hsf hsh hss saa sac saf sah sas sca scc scf sch scs sfa sfc sff sfh sfs sh- sha shc shf shh shs ss- ssa ssc ssf ssh sss