the grid graph Gm,n refers to the graph obtained by taking an m × n rectangular grid of streets (m ≤ n) with m north/south blocks and n east/west blocks. For example: 
-Find the region-chromatic number for Gm,n (including the infinite face).
Definitions:
Repurchasing Capital Stock
A corporate action in which a company buys back its own shares from the marketplace, reducing the amount of outstanding stock.
Negative Free Cash Flow
A situation where a company's cash outflows exceed its cash inflows during a specific period, indicating potential financial difficulties.
Free Cash Flow
The amount of cash generated by a company after accounting for operational expenses and capital expenditures.
Poor Performance
A situation where an individual or entity fails to meet established standards or expectations in terms of output, efficiency, or effectiveness.
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