<｜begin▁of▁sentence｜>### Instruction:
How would you save a circle layout representation of an undirected graph with nodes A, B, C, D, edges between A to each other node, and B to C as an SVG file using igraph's write_svg function, setting a green color for nodes and a black color for edges, with a custom pixel size for vertices and edges?
### Response:
from igraph import Graph

# Define the vertices and edges
vertices = ['A', 'B', 'C', 'D']
edges = [(0, 1), (0, 2), (0, 3), (1, 2)]

# Create the graph
g = Graph(edges=edges)
g.vs['label'] = vertices  # Assign labels to the vertices

# Add some attributes
g.vs['color'] = 'green'
g.es['color'] = 'black'
g.es['width'] = 1

# Define layout
g_layout = g.layout('circle')

# Save the graph to an SVG file
g.write_svg('graph.svg', layout=g_layout, width=600, height=600, labels='label', colors='color', shapes=1, vertex_size=20, edge_colors='color', edge_stroke_widths='width', font_size='14px')
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