HELPLIB.HLB  —  FORTRAN  Source Format
  Source code can be in free, fixed, or tab format.  Fixed or tab
  forms must not be mixed with free form in the same source program,
  but different source forms can be used in different source
  programs.

  All source forms allow lowercase characters to be used as an
  alternative to uppercase characters.

  More than one statement (or partial statement) can appear on a
  single source line if a statement separator is placed between the
  statements.

  The statement separator is a semicolon character (;).  Consecutive
  semicolons (with or without intervening blanks) are considered to
  be one semicolon.  If a semicolon is the last character on a line,
  or the last character before a comment, it is ignored.
Additional Information: explode extract
Free Form Fixed and Tab Format Example
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