| http://www.w3.org/ns/prov#value | - I can do the changing colours ok, but I do not know how to do nothing, because cell A4 is summing A1, A2 and A3 as zero even if they are empty and so changing the row colour to red, I do not want that I want the row coulour not to change to anything until there is a value entered, the value being zero or anything else.
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