def similarities(string_a, *string_b)
      [*string_b].map { |word| [word, matches[word] = similarity(string_a, word)] }
    end
def similarities(string_a, *string_b)
      [*string_b].map { |word| [word, matches[word] = similarity(string_a, word)] }
    end
Returns a hash of array 'b' with the percentage match to a. If sort is true,
 the hash is sorted desc by match percent.