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Which of the following are general principles for pattern alteration? a) As far as possible, make changes within the pattern by slashing and spreading or slashing and lapping. b) Where there are darts, make changes between the tip of the dart and the outside edge. c) When tucks or darts are used for making a pattern smaller, remember that the width of these should be just half the amount to be removed. d) To preserve the original grain line, make all slashes and folds parallel or perpendicular to the grain line.