Table:
primary donors
other donors
non-donors

percentage

total
100
100
100

men
53
48
55

women
47
52
45

age group

15 to 34 years
15
31
47

35 to 54 years
34
36
27

55 years and older
51
34
26

level of education

less than a high school diploma
5
9
20

high school diploma
19
27
30

postsecondary diploma or certificate
29
36
27

university degree
46
28
22

household income quintile

lowest quintile
13
19
29

second quintile
16
20
22

third quintile
18
20
19

fourth quintile
22
20
17

highest quintile
30
20
14

personal income quintile

lowest quintile
8
19
32

second quintile
14
19
27

third quintile
19
21
17

fourth quintile
22
21
15

highest quintile
36
21
10

participation in religious activities

does not participate in religious activities at least once a week
46
86
92

participates in religious activities at least once a week
54
14
8

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 areas are as follows:
{'top-left':(1, 1), 'bottom-right':(2, 1)}
{'top-left':(2, 2), 'bottom-right':(2, 4)}
{'top-left':(6, 2), 'bottom-right':(6, 4)}
{'top-left':(10, 2), 'bottom-right':(10, 4)}
{'top-left':(15, 2), 'bottom-right':(15, 4)}
{'top-left':(21, 2), 'bottom-right':(21, 4)}
{'top-left':(27, 2), 'bottom-right':(27, 4)}.