The restrictive covenants and exclusivity provisions which the bill applies are set out in the new section 28A, inserted by clause 4. There are, effectively, two requirements: (1) that the covenant or other provision is one in which a designated grocery retailer has an interest as defined by section 28A(5); (2) that the covenant or other provision has the purpose, effect, or likely effect of impeding use of the land or site as a retail store by an existing or new competitor.