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Prearranged signs
  The following prearranged signs are used in the published tables:
  Dash ( - ) a) when the observed phenomenon does not exist;
    b) when the phenomenon exists and was registered, but there were no occurrences.
  Two little dots ( .. ) in place of numbers smaller than half the minimum order digit.
Per cent compositions
  Per cent compositions are automatically rounded to the first decimal place. Hence, the total per cent value could be different from 100.