Required drafting as follows:

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84 Note to Bidders: the Authority will only accept Excusing Causes on a limited basis. The Authority will expect any Excusing Causes to be tightly defined and their application and any associated relief clearly set out. NB: Excusing Causes shall not be proposed as a means of derogating from SoPC4 or to undermine the risk allocation assumed in the guidance on Supervening Events.