Such exclusions may be referred to as exclusions or exemptions. These may be referred to as exempt income, exclusions, or tax exemptions. Such exclusions or exemptions can be quite specific or very general. Such restrictions are known as "exclusions from patentability". Dividend exclusions and certain corporation-only deductions may significantly lower the effective rate. The rights of Article 10 are subject to the exclusions of the aforementioned clauses. There are several exclusions and deductions (e.g. agricultural land, primary residence, transfers between spouses). Many systems provide for specific exclusions from taxable (chargeable) income. Some state rules provide for different inclusions and exclusions. Returns are required if the gifts or gross estate exceed the exclusions. The exclusions differ at federal and state levels. It then goes on to list eight additional specific exclusions and further details. In most cases, governments and their agencies fail to protect transgender people against these exclusions. The only exclusions are those on the Forbidden Weapons List. Political exclusions and oligarchical tendencies within societies create "linkage failures".