(1) If af becomes aware of anything that may cause delay to the 'Subcontract Works', af GmbH must provide the 'Main Contractor' with written notice of the cause and estimated delay within 5 days of becoming aware, or the date when af ought reasonably to have become aware, of the cause. (2) If af wishes to claim an 'Extension of Time' in respect of a delay to the 'Subcontract Works', af must within 10 days of the earlier of a) when the af became aware, or b) should reasonably have become aware of the commencement of the delay, give the 'Main Contractor' a written claim for an ’Extension of Time' to the 'Date for Practical Completion' with all necessary supporting documentation, setting out: (a) the cause of delay; (b) the period during which the cause or delay existed or is expected to exist; (c) the measures which af has or will adopt to overcome, minimise or otherwise deal with the delay; and (d) the critical activities delayed as identified on af’s programme. question - What is the difference between these two provisions of the contract?