The .FLAGS PERIOD and .NO FLAGS PERIOD commands turn on and turn
    off recognition of the Period flag character (+). When the period
    flag is in effect, an extra space is inserted after the following
    punctuation marks: period (.), colon (:), question mark (?) and
    exclamation point (!).

    Formats

      .FLAGS PERIOD  [k]

      .NO FLAGS PERIOD

    Abreviated formats

      .FL PERIOD  [k]

      .NFL PERIOD