Node number or node set label, P, of first nodal
variable, .
Degree of freedom, i, at above node for variable
.
Value of .
Node number or node set label, Q, of second nodal
variable, .
Degree of freedom, j, at above node for variable
.
Value of .
Etc., up to four terms per line.
Repeat the second data line as
often as necessary to define all of the terms of the equation. No more than
four terms can be defined on a line. To define another constraint, repeat the
entire set of data
lines.