ength>{2,4} && <color>?

  A comma-separated pair of numbers in curly braces {A,B}
  indicates that the preceding type, word, or group occurs
  at least A and at most B times.

  A question mark (?) indicates that the preceding type,
  word, or group is optional (occurs zero or one times).

  The components of each <shadow> are interpreted as follows:

  1st <length>
    Specifies the horizontal offset
    of the shadow. A positive value draws a shadow that is offset to the right of the box, a negative leng