<｜begin▁of▁sentence｜>### Instruction:
Could you please guide me on how to position the cargo in a circular arrangement around the center, using the Reingold-Tilford layout in a tree-based delivery route map? I need to ensure that the starting point for the delivery is at the center, and the cargo locations are placed in a circular pattern around it. I'm using NetworkX as the library for creating the map.
### Response:
import igraph as ig
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