Table:
Kunstbibliothek Berlin

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Location	Matthäikirchplatz 6
Berlin, Germany, Germany
Established	1972
Collection
Items collected	books, photographs
Size	333,057 books
24,000 rare books
59,809 auction catalogs
49,831 microforms
1422 journal subscriptions
Legal deposit	No
Access and use
Access requirements	Open to anyone with a need to use the collections and services
Circulation	Does not circulate
Other information
Director	Joachim Brand
Website	www.ifskb.de

Given a table image, please tell me which table cells are merged cells. Return the merged cell areas in the JSON format of {'top-left':(X, Y), 'bottom-right':(Z, W)}, where (X, Y) and (Z, W) 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.

The merged cell areas are as follows:
{'top-left':(4, 1), 'bottom-right':(4, 2)}
{'top-left':(8, 1), 'bottom-right':(8, 2)}
{'top-left':(11, 1), 'bottom-right':(11, 2)}.