if comments on any documents are not responded by contractor within said period, subcontractor may assume that contractor does not have any comments on the documents in question. in such cases, subcontractor shall advise contractor in writing that subcontractor is proceeding with the work. however, contractor's response time shall not apply to those documents which have been disapproved, commented upon, or rejected by or on behalf of contractor and which were initially submitted incomplete or rejected by or on behalf of contractor and which were initially submitted incomplete or un-coordinated.