<｜begin▁of▁sentence｜>### Instruction:
As an art therapist, you have a client who is working on a project related to network graphs. The client has created an Erdős–Rényi graph with 10 vertices and 20 edges and is now seeking to visualize it using a dendrogram with a 'top_to_bottom' orientation. You're looking to utilize the MatplotlibDendrogramDrawer class to initialize the drawer with a given matplotlib Axes object to achieve this visualization.
### Response:
import igraph as ig
import matplotlib.pyplot as plt
from igraph.drawing.matplotlib.dendrogram import MatplotlibDendrogramDrawer

g = ig.Graph.Erdos_Renyi(n=10, m=20)
dendrogram = g.community_edge_betweenness()
fig, ax = plt.subplots()
drawer = MatplotlibDendrogramDrawer(ax)
drawer.draw(dendrogram, orientation='top_to_bottom')
plt.show()
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