<｜begin▁of▁sentence｜>### Instruction:
As a speech-language pathologist, you often work with individuals across different age groups, assessing and treating a variety of speech, language, communication, or swallowing disorders. One tool you might utilize is CairoPlot, which allows you to create visual representations of data to aid in your diagnostic and therapeutic processes.

Imagine you're working with a group of high school students who are struggling with language comprehension. To assist in their understanding, you decide to incorporate visual aids using CairoPlot. You've recently been studying network theory and want to illustrate an Erdős–Rényi graph, a common model for random graphs, to demonstrate concepts of connectivity and relationships.

Your task is to generate an Erdős–Rényi graph with 10 vertices and 20 edges, and then utilize CairoPlot's `add` method to incorporate this graph into your visual presentation. Once you've created the visualization, you plan to save it as a PNG image, which you can then include in your educational materials for the students. This will provide them with a visual representation of complex graph theory concepts, aiding in their comprehension and retention of the material.
### Response:
from igraph import Graph
<|EOT|>
