Table:
sub-groups of the agri-food industry
eastern ontario
northern ontario

french-language workers
other workers
french-language workers
other workers

percent

input and service supply
2.9
2.1
2.9
1.3

food, beverage, and tobacco processing
9.7
6.0
3.0
3.3

food retail and wholesale
35.3
31.3
39.1
37.3

food service
52.1
60.6
55.0
58.1

Given a table image, please tell me which table cells are merged cells. Return the merged cell regions in the JSON format of {'top-left':(X1, Y1), 'bottom-right':(X2, Y2)}, where (X1, Y1) and (X2, Y2) represent the (row_id, column_id) coordinates of top-left cell and bottom-right cell, respectively. The row_id and column_id are numberd from 1.

The merged cell regions are as follows:
{'top-left':(1, 1), 'bottom-right':(3, 1)}
{'top-left':(1, 2), 'bottom-right':(1, 3)}
{'top-left':(1, 4), 'bottom-right':(1, 5)}
{'top-left':(3, 2), 'bottom-right':(3, 5)}.