<｜begin▁of▁sentence｜>### Instruction:
Given a simple undirected graph with vertices A, B, C, and D connected in a line (A-B-C-D), how would you create a visual representation with edges that transition from light to dark using the LightToDarkEdgeDrawer in igraph?
### Response:
from igraph import Graph
from igraph.drawing import Plot
from igraph.drawing.edge import LightToDarkEdgeDrawer
from igraph.drawing.colors import Palette

# Construct a simple graph
g = Graph.Formula('A--B--C--D')

# Create a plot with 600x600 pixels
plot = Plot(bbox=(600, 600))

# Define a palette
palette = Palette(['red', 'green', 'blue'])

# Create a context for the plot
context = plot.new_cairo()

# Create a LightToDarkEdgeDrawer with the context and palette
edge_drawer = LightToDarkEdgeDrawer(context, palette)

# Draw edges with the custom edge drawer
plot.redraw()

# Save the plot
plot.save('graph_with_light_to_dark_edges.png')
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