<｜begin▁of▁sentence｜>### Instruction:
As a Training Coordinator, imagine you're organizing a workshop on network analysis for your team. One of your colleagues, Sarah, is working on a project involving simple cycle graphs and needs to save one as a GML file for further analysis. She asks if you can demonstrate how to do this using the `write_gml` function in igraph. How would you guide Sarah through this process?
### Response:
import igraph as ig

# Create a simple graph
g = ig.Graph(edges=[(0, 1), (1, 2), (2, 3), (3, 0)])

# Write to a GML file
g.write_gml('output_graph.gml')
<|EOT|>
