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I need to have a website looking like excel sheet. No need to calculate or do anything, just add numbers and cells manually with a back-end CMS that controls all cells, rows and columns. I need this excel web page to have permissions for users where I can add permission for users who can read or read/write on cells or rows or columns. In other words user authenticates to see some of what he/she is allowed to see and definitely each user should have his own cms controls to modify cells and columns and rows. I am ready to any clarification when asked.