Table:
Amount Billed

2018	2019

Audit Fees(1)	$16,014,014	$17,639,702

Audit-Related Fees(2)	106,528	153,203

Tax Fees(3)	1,318,798	119,098

Other	—	—

Total Fees	$17,439,340	$17,912,003

Given a table image, please tell me which table cells are merged cells. Return the merged cell regions in the JSON format of {'top-left':(x, y), 'bottom-right':(m, n)}, where (x, y) and (m, n) 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.

This table does not contain any merged cells.