S. 72A : Carry forward and set off of accumulated loss and unabsorbed depreciation-Amalgamation-Demerger-Relaxation of conditions under r. 9C(a)-Power of Central Government is discretionary and to be exercised only in exceptional cases-Failure to achieve stipulated capacity utilisation-Rejection of relaxation upheld-Writ petition dismissed.[S. 72A(2), R. 9C(a), Art. 226]