Table:
retailers' sales of non-medical cannabis
wholesalers' retail sales of non-medical cannabis
total retail activity
wholesalers proportion of total retail activity

unadjusted dollars
percent

total
907,833
17,541
925,374
1.9

september 2019
121,453
904
122,357
0.7

august 2019
124,576
931
125,507
0.7

july 2019
106,065
1,095
107,160
1.0

june 2019
89,811
1,232
91,043
1.4

may 2019
82,384
1,377
83,761
1.6

april 2019
72,895
1,380
74,275
1.9

march 2019
59,350
1,391
60,741
2.3

february 2019
50,292
1,419
51,711
2.7

january 2019
53,294
1,796
55,090
3.3

december 2018
55,808
2,005
57,813
3.5

november 2018
52,322
2,409
54,731
4.4

october 2018
39,583
1,602
41,185
3.9

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':(x, y), 'bottom-right':(z, w)}, where (x, y) and (z, w) 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':(2, 1)}
{'top-left':(2, 2), 'bottom-right':(2, 4)}.