Table:
all medium-sized firms
become large
remain medium-sized
become small

percent

productivity quartile in year t

first quartile
24.9
13.9
22.1
40.7

second quartile
25.0
16.7
25.4
24.3

third quartile
25.0
30.1
26.1
18.5

fourth quartile
25.1
39.3
26.5
16.5

productivity quartile in year t-5

first quartile
24.9
17.1
23.3
33.9

second quartile
25.0
15.9
25.1
25.6

third quartile
25.0
27.1
25.5
22.3

fourth quartile
25.1
39.9
26.1
18.2

In this table image, can you identify any merged cells and provide their locations in the JSON format of {'top-left':(X, Y), 'bottom-right':(Z, W)}, where (X, Y) is the top-left and (Z, W) is the bottom-right cell coordinates? Cell coordinates start from (1,1).

The merged cell areas are as follows:
{'top-left':(1, 1), 'bottom-right':(2, 1)}
{'top-left':(2, 2), 'bottom-right':(2, 5)}
{'top-left':(3, 2), 'bottom-right':(3, 5)}
{'top-left':(8, 2), 'bottom-right':(8, 5)}.