*XB* = As long as it is less than .618 we are fine but we prefer it to be .382 to .500.
*BD* = As long as it is more than 1.618 we are fine but we prefer it to be 1.618 to 2.618. This is not much that important.
*AB* = CD pattern is usually extended. We shall talk about this in the example.
*XD* = 0.886. Slight deviation is OK.
*AC* = Range between 0.382 and ...