3- Notice of Dissatisfaction with an instruction The clause to be revoked may be some or all of the clauses previously delegated. This revocation shall become effective when copies of this letter have been delivered to the Employer and to the Contractor. With reference to my letter dated ………… I hereby revoke the delegation to you of the duties and authorities made pursuant to clause 2.3 of the conditions in respect of the following clauses ………………….