definiens: ( and words of similar import ) mean the actual knowledge of Michael Dwyer, Gavin Anderson, John Kerr, and Hugh Hierholzer, none of whom shall have any personal liability or obligations regarding such knowledge of Seller ; ( p ) no parol evidence will be introduced in the construction or interpretation of this Agreement unless the ambiguity or uncertainty in issue is plainly discernable from a reading of this Agreement without consideration of any extrinsic evidenc e ; and ( q ) the Parties have participated jointly in the negotiation and drafting hereof ; if any ambiguity or question of intent or interpretation arises, this Agreement will be construed as if drafted jointly by the Parties, and no presumption or burden of proof will arise favoring or disfavoring any Party by virtue of the authorship of any provision hereof ; no prior draft of this Agreement nor any course of performance or course of dealing will be used in the interpretation or construction hereof