Table:
Subgame Perfect Equilibrium
Subset of	Nash equilibrium
Intersects with	Evolutionarily stable strategy
Proposed by	Reinhard Selten
Used for	Extensive form games
Example	Ultimatum game

The task is as follows:
Analyze the table in this image to find every merged cell. Return the regions of these merged cells in the JSON {'top-left':(A, B), 'bottom-right':(C, D)}, where '(A, B)' and '(C, D)' show the (row_id, column_id) of the top-left and bottom-right cells in these regions, respectively. The row and column IDs start from 1.

The merged cell area is: {'top-left':(1, 1), 'bottom-right':(1, 2)}.