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Use with caution, and sparingly! If the combination of values from Protonyms can not reflect the formulation of the combination as provided by the original author that string can be provided here.
The verbatim value is not further parsed. It is only provided to clarify what the combination looked like when first published.
The following recommendations are made:
  1) The provided string should visually reflect as close as possible what was seen in the publication itself, including
  capitalization, accented characters etc.
  2) The full epithet (combination) should be provided, not just the differing component part (see 3 below).
  3) Misspellings can be more acurately reflected by creating new Protonyms.
Example uses:
  1) Jones 1915 publishes Aus aus. Smith 1920 uses, literally "Aus (Bus) Janes 1915".
     It is clear "Janes" is "Jones", therefor "Aus (Bus) Janes 1915" is provided as combination_verbatim_name.
  2) Smith 1800 publishes Aus Jonesi (i.e. Aus jonesi). The combination_combination_verbatim name is used to
     provide the fact that Jonesi was capitalized.
  3) "Aus brocen" is used for "Aus broken".  If the curators decide not to create a new protonym, perhaps because
     they feel "brocen" was a printing press error that left off the straight bit of the "k" then they should minimally
     include "Aus brocen" in this field, rather than just "brocen". An alternative is to create a new Protonym "brocen".
  4) 'Aus (Aus)' was originally described in 1920.  "(Aus)" was used in a new combination alone as "Aus".  This is the only case
     in which combination may contain a single protonym.
@return [String]
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