Table:
($ in millions)

For the year ended December 31:	2019	2018	2017

RSUs

Granted	$674	$583	$484

Vested	428	381	463

PSUs

Granted	$164	$118	$113

Vested	118	101	51

A merged cell in a table can be described using the JSON {'top-left':(X1, Y1), 'bottom-right':(X2, Y2)}. Here, '(X1, Y1)' represents the top-left and '(X2, Y2)' the bottom-right cells' (row_id, column_id) of the merged region. Using the displayed table image, identify all such merged cells in this table and report their locations in the given format. Note that the numbering of both row and column IDs starts at 1.

This table does not contain any merged cells.