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Rigid constraints are defined using the command `PROPERTY BOUNDARY CONSTRAINT' and, where a local coordinate system has not been associated, are incorporated in the node coordinate definitions.
Rigid constraints to which a local coordinate system has been attached are output on separate cards followed by a series of local coordinate system definition cards. Local coordinate systems are created using the command 'CONSTRUCT COORDSYS ...', and attached to a part or set using the command 'PROPERTY ATTACH ...'.
This section of the input file is preceeded by the following cards:
* * RESTRAINT CARDS ... *