<｜begin▁of▁sentence｜>### Instruction:
As a network analyst, you're tasked with examining the communication network within a large organization. The network map includes the flow of information from department to department, with some departments having one-way communication channels to others. In the specific case, you need to identify the arrow sizes for the communication channels between the Marketing ('A') and Sales ('B') departments and the Operations ('C') and Finance ('D') departments. The goal is to visualize the flow of communication and assess the intensity of information exchange between these key areas of the organization. You can programmatically achieve this using the NetworkX library in Python.
### Response:
from igraph import Graph

# Create a simple directed graph with A->B and C->D
g = Graph.Formula('A->B, C->D', directed=True)

# Get the arrow sizes for the edges
arrow_sizes = g.es.get_arrow_size()

# Print the arrow sizes
print(arrow_sizes)
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