<｜begin▁of▁sentence｜>### Instruction:
In the garden of interconnected flora, imagine each species as a node in a grand display network, with directed pathways like vines illustrating the flow of nutrients from one plant to another. Picture a layout where 'A' represents roses, 'B' stands for tulips, 'C' embodies orchids, and 'D' symbolizes daisies. The intertwined relationships are as follows: roses feed into tulips ('A' to 'B'), tulips pass sustenance to orchids ('B' to 'C'), orchids cycle back to roses ('C' to 'A'), and also extend their reach to daisies ('C' to 'D'). As a skilled florist looking to comprehend the structural vitality of this arrangement, could you kindly determine the gradation of reliance or the flow hierarchy within this botanical network using the insightful tool NetworkX, while ensuring that the aesthetic and health of your floral system are maintained?
### Response:
import networkx as nx

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

# Compute the flow hierarchy
hierarchy = nx.flow_hierarchy(G)

print("Flow hierarchy of the graph:", hierarchy)
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