Table:
sector
imports
exports

all firms
immigrant-owned firms
canadian-owned firms
all firms
immigrant-owned firms
canadian-owned firms

percent

agriculture, forestry, fishing and hunting
1.05
1.25
1.03
4.10
2.39
4.38

mining, oil and gas extraction, and utilities
0.44
0.55
0.43
0.95
1.74
0.82

construction
2.14
1.06
2.27
1.90
0.61
2.11

manufacturing
25.99
20.30
26.67
55.34
39.33
57.91

wholesale trade
51.18
60.45
50.06
21.06
39.74
18.05

retail trade
10.72
8.84
10.94
1.53
5.98
0.81

transportation and warehousing
2.05
1.50
2.12
2.59
2.60
2.59

professional services
5.05
4.52
5.12
11.80
6.91
12.58

education and health services
0.13
0.19
0.12
0.06
0.12
0.05

arts, entertainment and recreation, and accommodation and food services
0.30
0.37
0.29
0.22
0.27
0.21

other services
0.96
0.97
0.95
0.45
0.32
0.47

A table may have multiple merged cells and we can represent a merged cell region by a JSON {'top-left':(A, B), 'bottom-right':(C, D)}. Here, '(A, B)' and '(C, D)' denote the coordinates (row_id, column_id) of the top-left and bottom-right cells of the merged regions, respectively. Now, based on the shown table image, please find all merged cells in this table and return their representations in the above format. Keep in mind that row and column IDs start from 1.

The merged cell areas are as follows:
{'top-left':(1, 1), 'bottom-right':(3, 1)}
{'top-left':(1, 2), 'bottom-right':(1, 4)}
{'top-left':(1, 5), 'bottom-right':(1, 7)}
{'top-left':(3, 2), 'bottom-right':(3, 7)}.