<｜begin▁of▁sentence｜>### Instruction:
Given a bipartite graph with node set [{1, 2, 3, 4}, {'a', 'b', 'c'}] and edge set [(1, 'a'), (1, 'b'), (2, 'b'), (2, 'c'), (3, 'c'), (4, 'a')], how do you position the nodes in two straight lines using the 'bipartite_layout' function from NetworkX?
### Response:
import networkx as nx
from networkx.drawing.layout import bipartite_layout

# Create a bipartite graph
B = nx.Graph()
B.add_nodes_from([1, 2, 3, 4], bipartite=0)
B.add_nodes_from(['a', 'b', 'c'], bipartite=1)
B.add_edges_from([(1, 'a'), (1, 'b'), (2, 'b'), (2, 'c'), (3, 'c'), (4, 'a')])

# Specify the nodes that will be on the left (or top if horizontal)
top_nodes = [1, 2, 3, 4]

# Use the bipartite layout algorithm
pos = bipartite_layout(B, top_nodes, align='vertical', scale=1, center=(0, 0), aspect_ratio=4/3)

print('Node positions:')
for node, position in pos.items():
    print(f'{node}: {position}')
<|EOT|>
