splinecurves2dv2
# grading parameter
5

points
# number  x_n y_n
1  0.0 0.0
2  1.0 0.0
3  1.0 1.0
4  0.0 1.0

segments
# dil dir   line/arc    P_1 P_2     boundary condition
1 0         2           1   2       --bc=1
1 0         2           2   3       --bc=1
1 0         2           3   4       --bc=1
1 0         2           4   1       --bc=1
