Table:
Curling

at the XXIII Olympic Winter Games

Venue	Gangneung Gymnasium
Dates	8–25 February
No. of events	3 (1 men, 1 women, 1 mixed)
Competitors	116 from 13 nations

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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 regions are as follows:
{'top-left':(1, 1), 'bottom-right':(1, 2)}
{'top-left':(6, 1), 'bottom-right':(6, 2)}.