def import_wheels(node_positions, wheels, object_holder):
    fix_negative_rigidity_nodes(wheels)
    group_helper = GroupBy.DictHelper()
    group_helper.dont_autocompare = ['node1', 'node2']
    grouped_wheels = GroupBy.group_by_comparison_function(group_helper.perform_camparison, wheels)
    for i, wheel_group in enumerate(grouped_wheels):
        import_wheel(i, node_positions, wheel_group, object_holder)
def import_shocks(node_positions, shocks, object_holder):
    group_helper = GroupBy.DictHelper()
    group_helper.dont_autocompare = ['node1', 'node2']
    grouped_shocks = GroupBy.group_by_comparison_function(group_helper.perform_camparison, shocks)
    for i, shock_group in enumerate(grouped_shocks):
        import_shock(i, node_positions, shock_group, object_holder)