What are the sub-clauses (a), (b) and (c) restructured as a result of the Constitution (Forty-fourth Amendment) Act, 1978?
As per the given context, the sub-clauses (a), (b) and (c) of clause (7) were restructured as a result of the Constitution (Forty-fourth Amendment) Act, 1978, as follows:

 Sub-clause (a) shall stand omitted by s. 3(b)(i), ibid. (date to be notified).

 Sub-clause (b) shall stand re-lettered as sub-clause (a) by s. 3(b)(ii), ibid. (date to be notified).

 Sub-clause (c) shall stand re-lettered as sub-clause (b) by s. 3(b)(iii), ibid. (date to be notified).