six that he never knew or heard to his now remembrance that there was any alteration change or variation of any copy or copies or in the court rolls of the said manor or of either of them or any presentments or surrenders or admittances of any tenant or tenants to any lands or tenements holden of the said manors or of either of them in any manner or sort from the actual or real truth of the said presentments surrenders or admittances nor of any certain knowledge or credible report can depose anything material to any the further contents of this interrogatory to his now remembrance