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PSL is a property specification language. It is a means to express properties of a design, and in addition to specify how verification tools should use those properties. For example, a property may be asserted — this specifies that the design in question is expected to behave as described by the property. A property may also be assumed — this specifies that the design in question expects its inputs to behave as described by the property. PSL also provides other directives, for instance a means to specify scenarios that should be covered.