The table below, from an old published road map, purports to give the length of the shortest routes connecting the cities. It contains an error. Correct the table. Also, add a table that shows how to achieve the shortest routes.
Providence | Westerly | New London | Norwich | |
Providence | - | 53 | 54 | 48 |
Westerly | 53 | - | 18 | 101 |
New London | 54 | 18 | - | 12 |
Norwich | 48 | 101 | 12 | - |
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