<｜begin▁of▁sentence｜>### Instruction:
As a Systems Analyst working in a tech company that specializes in network optimization, you have been tasked with analyzing and optimizing the connectivity of a given network graph. The graph has the following edges: [(0, 1), (0, 2), (1, 3), (1, 4), (2, 5), (2, 6)]. Using the Depth-First Search (DFS) algorithm starting from vertex 0, you are required to determine the order in which the vertices are visited for network analysis and improvement recommendations.
### Response:
from igraph import Graph

# Define the edges for the graph
g = Graph(edges=[(0, 1), (0, 2), (1, 3), (1, 4), (2, 5), (2, 6)])

# Perform a depth-first search (DFS) starting from vertex 0
dfs_iter = g.dfsiter(0, mode='OUT')

# Iterate over vertices in the order they are visited during DFS and print them
for visit in dfs_iter:
    print(visit)
<|EOT|>
