<｜begin▁of▁sentence｜>### Instruction:
As a Recreation Therapist, you're tasked with planning and organizing recreational activities for individuals facing disabilities or illnesses. Suppose you're utilizing a specialized tool called the igraph, which assists in visualizing graphs representing activity options. Imagine you've created a graph representing potential activities, with vertices labeled as ['A', 'B', 'C', 'D'] denoting different activities, and edges labeled ['AB', 'BC', 'CD'] indicating connections between them.

Now, your task is to determine the optimal rotation angle for the label of the edge representing the connection between activity A and activity B. To do this, you'll utilize a method called `get_label_rotation` from the AbstractEdgeDrawer within the igraph tool. Your goal is to calculate this rotation angle to ensure the label is clearly visible and aligned appropriately with the graph visualization.
### Response:
import igraph as ig

# Create a graph and add some edges
g = ig.Graph(edges=[(0, 1), (1, 2), (2, 3)])
g.vs['label'] = ['A', 'B', 'C', 'D']  # Setting vertex labels
g.es['label'] = ['AB', 'BC', 'CD']  # Setting edge labels

# Assuming we have an edge drawer object initialized
# Typically, this is internal to igraph's plotting mechanism and not directly instantiated by the user
edge_drawer = ig.drawing.edge.AbstractEdgeDrawer(g)

# Get label rotation for the edge from vertex A to B
rotation_angle = edge_drawer.get_label_rotation(g.es[0], g.vs[0], g.vs[1])
print(f'The rotation angle of the label for edge AB is: {rotation_angle} degrees')
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