<｜begin▁of▁sentence｜>### Instruction:
Given a directed acyclic graph (DAG) with edges [('A', 'B'), ('B', 'C'), ('C', 'D'), ('A', 'C')], determine if the set {'B', 'C'} is a minimal d-separating set to disconnect node 'A' from node 'D'.
### Response:
import networkx as nx

# Create a directed acyclic graph (DAG)
G = nx.DiGraph()
G.add_edge('A', 'B')
G.add_edge('B', 'C')
G.add_edge('C', 'D')
G.add_edge('A', 'C')

# Define the nodes u and v
u = 'A'
v = 'D'

# Define the d-separating set
z = {'B', 'C'}

# Check if z is a minimal d-separating set between u and v
is_minimal = nx.is_minimal_d_separator(G, u, v, z)

print('Is the set z a minimal d-separating set between u and v?', is_minimal)
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