Table:
household income
percentage
mean number of hours

less than $20,000
33
182

$20,000 to $39,999
34
172

$40,000 to $59,999
37
165

$60,000 to $79,999
41
179

$80,000 to $99,999
44
148

$100,000 to $119,999
50
171

$120,000 and over
52
130

This image shows a table. Determine whether this table contains merged cells and output merged cell regions with the JSON format of {'top-left':(x, y), 'bottom-right':(m, n)}, where x, y, m and n represent the indices of the first row, the first column, the last row, and the last column in the merged region. Row and column indices are numberd from 1.

This table does not contain any merged cells.