Test Keymap

Use arrow keys to move the cursor in cells.
Press RETURN to color a cell.
Type digits or Ctrl-vowels to insert content in cells.
Try combinations Ctrl-X A, Ctrl-X B, Ctrl-X R K, Ctrl-X R O.
           
           
           
           
            
           
           
           
           
Use buttons below to push new rules or pop to previous rules.