Table:
Balance at Beginning of

Period (1/1/19)	Increase / (Decrease)	Balance at End of Period

Year Ended December 31, 2019

Accounts receivable	$90,831	$7,117	$97,948

Deferred revenue (current)	$5,101	$(618)	$4,483

Deferred revenue (non-current)	$3,707	$(263)	$3,444

Analyze the provided table and extract the contents of specified rows or columns, identified by row or column indices. Show the cells in each row or column in the JSON format {"row_id/column_id":"<row or column index>", "cell_list":"<a list of cells in this row/column>"}. For example, {"row_id":"3", "cell_list": ["A", "B", "C"]}.
Target rows or columns:
the 2nd column,
the 1st row,
the 2nd row,
the 4th row,

The extracted row or column contents are listed below.
For the 2nd column: {"column_id": "2", "cell_list": ['Balance at Beginning of', 'Period (1/1/19)', '', '$90,831', '$5,101', '$3,707']}
For the 1st row: {"row_id": "1", "cell_list": ['', 'Balance at Beginning of', '', '']}
For the 2nd row: {"row_id": "2", "cell_list": ['', 'Period (1/1/19)', 'Increase / (Decrease)', 'Balance at End of Period']}
For the 4th row: {"row_id": "4", "cell_list": ['Accounts receivable', '$90,831', '$7,117', '$97,948']}