Table:
number of years with t4 earnings
men
women

percentage
mean annual t4 earnings
mean cumulative t4 earnings
percentage
mean annual t4 earnings
mean cumulative t4 earnings

percent
2016 constant dollars
percent
2016 constant dollars

0
28.9
..
..
51.0
..
..

1
10.5
7,300
7,300
11.5
4,800
4,800

2
10.3
11,300
22,700
7.1
4,800
9,500

3
10.0
16,200
48,500
8.4
8,800
26,400

4
12.4
19,400
77,400
8.2
11,100
44,500

5
27.9
42,200
211,200
13.7
22,000
109,800

Given a table image, please tell me which table cells are merged cells. Return the merged cell areas in the JSON format of {'top-left':(R1, C1), 'bottom-right':(R2, C2)}, where (R1, C1) and (R2, C2) represent the (row_id, column_id) coordinates of top-left cell and bottom-right cell, respectively. The row_id and column_id are numberd 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, 3), 'bottom-right':(3, 4)}
{'top-left':(3, 6), 'bottom-right':(3, 7)}.