<s>[INST] What is the significance of "Ins. by s. 2, ibid. (w.e.f. 17-10-1973)"? [/INST] The phrase "Ins. by s. 2, ibid. (w.e.f. 17-10-1973)" stands for "Inserted by section 2 of the same Act (which came into effect from 17th October, 1973)." In this context, it refers to an amendment or insertion made in a particular law or statute by a specific section of that act. The date mentioned indicates when this change became effective. </s>