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 GAP <number>
 Sets the gap (space) between two items. So if you set Gap to 0,
 there will be no space between the items. If you set it to 2,
 there will be a space of two pixels between every button (item).
 Note that the lines set by startbox and endbox only will be seen if
 you have a gap of 2 or more. Also see Gap Demo.

 Default is 2

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