I don't think that contract actually needs a substitution clause because "the Consultant" is the company, and there's nothing contracted about who the company assigns to carry out the services, so it should be the company's free choice.
(but to then find the company called "he" in 6.1.3 and "he/she" in 8.1 is a bit iffy)
(but to then find the company called "he" in 6.1.3 and "he/she" in 8.1 is a bit iffy)
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