<｜begin▁of▁sentence｜>### Instruction:
Given a directed graph where the vertices represent states and the directed edges represent transitions between these states, use the CairoArrowEdgeDrawer.draw_directed_edge method in igraph to manually draw a directed edge from one state to another and then visualize the graph. Assume the graph's visual style is set up with labels on vertices and custom arrow sizes.
### Response:
from igraph import Graph, plot
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