<｜begin▁of▁sentence｜>### Instruction:
As a scientific illustrator, imagine you are tasked with creating a visual representation of a hypothetical network of connected scientific laboratories. The network consists of four laboratories arranged in a 2x2 grid. To highlight the presence of a specific research project at one of the laboratories, you have been asked to include a loop edge representing a connection between the laboratory and itself. Utilizing the CairoArrowEdgeDrawer's draw_loop_edge function, you are to depict the loop edge with an arrow to emphasize the significance of this particular research project within the network.
### Response:
import igraph as ig
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