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All the functionality of section Row Manipulation applies to the
constraints.
Assume `a` and `b` are of the class `constraint`

and
`n`, `i` and `j` are integers.

`constraint a();`

`a.init();`

`constraint a(i);`

`a.init(i);`

`constraint a(b);`

`constraint a(&b);`

`a.init(b);`

`a.init(&b);`

- The constructors and initializing routines for the constraints.

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