78. “53, 54 and 54B” substituted for “53 and 54” by the Finance Act, 1970, w.e.f. 1-4-1970; “53, 54, 54B and 54C” substituted for “53, 54 and 54B” by the Finance Act, 1972, w.e.f. 1-4-1973 and “53, 54, 54B, 54C and 54D” substituted for “53, 54, 54B and 54C” by the Finance Act, 1973, w.e.f. 1-4-1974.