题目内容：

问一道离散数学题
Assume that a chocolate bar consists of n squares arranged in a rect-
angular pattern.The bar,a smaller rectangular piece of the bar,can
be broken along a vertical or a horizontal line separating the squares.
Assuming that only one piece can be broken at a time,determine how
many breaks you must successively make to break the bar into n sep-
arate pieces.Use strong induction to prove your answer.