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Simplify mechanism of maintaining the letters used in an ordering. No need for the ugly hack to get around reducing to Value objects; just leave the letters attached to the Value object rather than deleting them.
Added a message for when the student answer does not include all the letters used in the correct answer.
Produce error messages if a letter is used more than once in an ordering.
Use the Package() method to create the ordering object, so that ordering objects can be properly subclassed.
New Context for handling ordered lists of letters like "D > A = C > B". See the comments for details about how to use it.
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