any land comprised in a holding, then notwithstanding anything to the contrary contained in sub section (2) of section 6, he shall pay : (a) in cases where he was paying rent for the land comprised in the holding and held by him immediately before the date of vesting (hereafter in this proviso referred to as the holding lands), (i) if he retains all the holding lands, the same rent as he 533 was paying therefore immediately before the date of vesting, and (ii) if the land retained by him forms part of the holding lands, such rent as bears the same proportion to the rent which he was paying for the holding lands immediately before the date of vesting as the area of the land retained by him bears to the area of all the holding lands; (b) in cases where he was liable to pay rent but was not paying any rent for the holding lands immediately before the date of vesting on the ground that the rent payable by him therefore was not assessed, such rent as may be assessed, mutatis mutandis, in accordance with the provisions of section 42; (c) in cases where he was liable to pay rent wholly in kind or partly in kind and partly in cash, then notwithstanding anything contained in clause (c) of section 5, such rent as may be assessed in accordance with the provisions of section 40, and (d) in cases where he was liable immediately before the date of vesting to pay for the holding lands a variable cash rent periodically assessed, such rent as may be assessed, mutatis mutandis in accordance with the provisions of section 42.