Problem modification routines change a problem object after it has been
created. The modifications that you can make are these:
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adding rows and columns to the constraint matrix,
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deleting rows and columns from the constraint matrix,
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changing the sense of the objective function,
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changing the value of coefficients in the constraint matrix,
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changing an objective or right-hand side coefficient,
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changing the bounds on a variable,
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changing the sense of a constraint,
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changing names of rows or columns.