Format specifications can include nested format specifications
  enclosed in parentheses; for example:

    15   FORMAT (E7.2,I8,I2,(A5,I6))

    35   FORMAT (A6,(L8(3I2)),A)

  A group repeat specification can precede a nested group of edit
  descriptors.  For example, the following statements are equivalent,
  and the second statement shows a group repeat specification:

    50   FORMAT (I8,I8,F8.3,E15.7,F8.3,E15.7,F8.3,E15.7,I5,I5)

    50   FORMAT (2I8,3(F8.3,E15.7),2I5)

  If a nested group does not show a repeat count, a default count of
  1 is assumed.

  Normally, the string edit descriptors and control edit descriptors
  cannot be repeated (except for slash), but any of these descriptors
  can be enclosed in parentheses and preceded by a group repeat
  specification.  For example, the following statements are valid:

    76   FORMAT ('MONTHLY',3('TOTAL'))

    100  FORMAT (I8,4(T7),A4)