I'm converting a massive fixed width file to a delimited one, but the file
has some fields missing. It's my job to try to deduce the value of each
missing field from another one present in that line of the file. One
example is deducing the missing zip code given the city field.
I have a hash of zipcode-city pairs. Since a city may have more than one
zip code, the zipcodes are the keys. If there is exactly 1 value in the
hash that matches the city in the line of the file, I need to get the key
for that value, but how can I do it?
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