Table:
headcount
share
age
males
employment accounted for by owner

number
percent
mean
percent
mean

self-employed

non-employer
2,163,790
95
52
54
..

employer
116,150
5
51
67
3.4

total
2,279,940
100
51
54
..

business owner

non-employer
317,830
26
56
59
..

employer
925,570
74
50
67
6.6

total
1,243,400
100
52
65
..

Your task is as follows:
In this table image, locate all merged cells and detail their regions using the JSON {'top-left':(x, y), 'bottom-right':(m, n)}. Here, '(x, y)' and '(m, n)' denote the coordinates (row_id, column_id) of the top-left and bottom-right cells of the merged regions, respectively. Keep in mind that row and column IDs start from 1.

The merged cell regions are as follows:
{'top-left':(1, 1), 'bottom-right':(2, 1)}
{'top-left':(3, 2), 'bottom-right':(3, 6)}
{'top-left':(7, 2), 'bottom-right':(7, 6)}.