Provided further that the provisions of the first proviso shall apply to a sir holder who was not at the commencement of this Act assessed in the United Provinces to a local rate of more than twenty five rupees if be or his predecessor in interest was so assessed on the 30th June, 1938 unless the local rate assessed on him has been decreased by resettlement or by revision of settlement or unless since that day he obtained his sir rights by succession or survivorship Provided also that if the land to which the provisions of the first proviso apply was joint air of several air holders and all, such joint air holders are not air holders to whom such provisions apply, such land shall not 910 cease to be sir at the commencement of this Act, but shall remain sir until that portion of it which is the sir of those joint holders to whom such provisions apply is demarcated under the provisions of this Act; (b) land which was khudkasht and which is demarcated as sir under the provisions of this Act.