Reason: Connotations are the feelings or emotions associated with a word. For example, “We bought inexpensive souvenirs at the amusement park” the connotation would be inexpensive because this adds positive emotion to the sentence.
Because from a connotation, the reader either gets a positive or negative feeling from that word. Ex: "I'll kill you!" definitely has a negative connotation (feeling).
But many of the hieroglyphs on this slab were missing also, so only a few words and phrases could be added to what was already known from the Rosetta Stone.