Table:
group 1
group 2
group 3

students aged 15 to 24 and non-students aged 15 to 24 living with their parents
persons aged 15 to 64 who are unattached, lone parents or spouses/partners in single-earner couples
persons aged 15 to 64 who are spouses/partners in dual-earner couples

number

number of minimum wage workers
520,200
259,400
274,800

percentage of all minimum wage workers
33.2
16.6
18.2

work patterns

average weekly work hours in their main job
17.8
31.7
32.4

percentage working full time
17.5
65.7
68.8

percentage working in temporary jobs
32.9
13.9
14.2

percentage working in retail trade, food and accommodation services
72.4
49.9
42.9

percentage holding multiple jobs
4.9
6.5
6.0

weekly wages of minimum wage workers

average
218
380
385

median
180
404
404

25th percentile
120
260
277

75th percentile
280
494
500

weekly wages of all employees in the economic family

average
1,788
454
1,435

median
1,703
422
1,323

25th percentile
919
280
1,010

75th percentile
2,505
520
1,750

family size

average
3.8
2.0
3.3

median
4.0
1.0
3.0

weekly wages of all employees in the economic family

average
909
347
817

median
867
323
756

25th percentile
500
210
553

75th percentile
1,254
455
1,014

other characteristics

percentage living in rented dwellings
27.7
62.1
38.2

percentage with at most a high school diploma
62.2
44.4
35.6

percentage with at least a bachelor's degree
3.0
18.7
26.0

percentage of women
54.1
60.4
65.8

percentage of immigrants
17.9
35.2
48.0

average age
19.1
40.6
42.4

percentage aged 35 to 64
0.0
60.3
72.1

I need you to conduct the following task:
Given this table image, find all merged table cells and return merged regions with the JSON {'top-left':(X1, Y1), 'bottom-right':(X2, Y2)},  where (X1, Y1) and (X2, Y2) indicate the (row_id, column_id) of top-left and bottom-right cells in the merged regions, respectively. You should remember that row id and column id start from 1.

The merged cell areas are as follows:
{'top-left':(1, 1), 'bottom-right':(3, 1)}
{'top-left':(3, 2), 'bottom-right':(3, 4)}
{'top-left':(6, 2), 'bottom-right':(6, 4)}
{'top-left':(12, 2), 'bottom-right':(12, 4)}
{'top-left':(17, 2), 'bottom-right':(17, 4)}
{'top-left':(22, 2), 'bottom-right':(22, 4)}
{'top-left':(25, 2), 'bottom-right':(25, 4)}
{'top-left':(30, 2), 'bottom-right':(30, 4)}.