# The optional TOPCOM package is pre-installed in SageMathCloud.

PointConfiguration.set_engine('topcom')   # optional - topcom
p = PointConfiguration([[-1,-5/9],[0,10/9],[1,-5/9],[-2,-10/9],[0,20/9],[2,-10/9]])
regular = p.restrict_to_regular_triangulations(True).triangulations_list()      # optional - topcom
nonregular = p.restrict_to_regular_triangulations(False).triangulations_list()  # optional - topcom
len(regular)     # optional - topcom

len(nonregular)  # optional - topcom

nonregular[0].plot(aspect_ratio=1, axes=False)   # optional - topcom
PointConfiguration.set_engine('internal')   # to make doctests independent of TOPCOM