450 "18(1) Notwithstanding anything to the contrary 'contained in any law, usage or contract, a tenant of a land owner other than a small land owner (i) who has been in continuous occupation of the land comprised in his tenancy for a minimum period of six years, or (ii) who has been restored to his tenancy under the provisions of this Act and whose periods of continuous occupation of the laud comprised in his tenancy immediately before ejectment and immediately after restoration of his tenancy together amounts to six years or more, or (iii) who was ejected from his tenancy after the 14th day of August 1947, and before the commencement of this Act, and who was in continuous occupation of the land comprised in his tenancy for a period of six years or ,more immediately before his ejectment, shall be entitled to purchase from the land owner the land so held by him but not included in the reserved area of the land owner, in the case of a tenant falling within clause (i) or clause (ii) at any time, and in the case of a tenant falling within clause (iii) ' within a period of one year from the date of commencement of this Act; Provided that no tenant referred to in this subsection shall be entitled to exercise any such fight in respect of the land or any portion thereof if he had sublet the land or the portion, as the case may be, to any other person during any period of his continuous occupation, unless during that period the tenant was suffering from a legal disability or physical infirmity, or, if a woman, was a widow or was unmarried; Provided further that if the land.