Table:
lowest quartile
second quartile
third quartile
highest quartile
total

percent

mobile devices only
24.1
14.7
13.8
8.0
13.5

personal computer
75.9
85.3
86.2
92.0
86.5

Examine the table in this image and extract any merged cell areas. Please format the merged cell areas as JSON {'top-left':(A, B), 'bottom-right':(C, D)}, with (A, B) indicating the (row_id, column_id) of the top-left cell and (C, D) the bottom-right cell in the merged regions. Remember that the A, B, C, D all 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, 6)}.