Determine which legal clause the following paragraph belongs to: To give the F under a reasonable time to decide whether to‘ step in’ under clause 6-4, clause 6-1 requires the Contractor to copy to the F under any warning notice which has to be given under the Building Contract before the Contractor can give notice to the Employer that the Contractor' s employment is terminated or, alternatively, to notify the F under if the Contractor considers that the Employer has repudiated the Building Contract.