<｜begin▁of▁sentence｜>### Instruction:
Given a graph with an edge set [(1, 2), (2, 3), (3, 4)], which edges should be added to make the graph 2-edge-connected, considering only the following edges available for augmentation: [(1, 4), (2, 4)]?
### Response:
import networkx as nx

# Create an unconnected graph
G = nx.Graph([(1, 2), (2, 3), (3, 4)])

# Desired edge connectivity
k = 2

# Available edges to be used for augmentation
avail = [(1, 4), (2, 4)]

# Using k_edge_augmentation to find edges that will make the graph k-edge-connected
augmentation = list(nx.k_edge_augmentation(G, k, avail=avail))

# Add the new edges to the graph
G.add_edges_from(augmentation)

# Print the augmentation
print('Edges to add for k-edge-connectivity:', augmentation)

# Print the new edge connectivity
print('New edge connectivity:', nx.edge_connectivity(G))
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