Table:
survey frame
sample size
classification

enumerated individuals
missed individuals
out of scope individuals
non-respondents

number

2006 census
54,772
47,854
3,152
2,343
1,423

missed individuals from 2006
5,431
3,787
737
452
455

births
3,619
3,223
226
55
115

immigrants
2,548
1,900
332
110
206

non-permanent residents
1,470
670
298
82
420

health insurance files
76,711
74,889
901
591
330

A table may have multiple merged cells and we can represent a merged cell region by a 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. 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 regions are as follows:
{'top-left':(1, 1), 'bottom-right':(3, 1)}
{'top-left':(1, 2), 'bottom-right':(2, 2)}
{'top-left':(1, 3), 'bottom-right':(1, 6)}
{'top-left':(3, 2), 'bottom-right':(3, 6)}.