Table:
rank	nation	gold	silver	bronze	total

1	united states	50	41	32	123

2	great britain	18	23	20	61

3	italy	14	15	16	45

4	australia	12	11	7	30

5	rhodesia	10	5	2	17

6	south africa	8	8	3	19

7	israel	7	3	11	21

8	argentina	6	15	16	37

9	west germany	5	2	5	12

10	netherlands	4	6	4	14

A merged cell in a table could be represented by the JSON {'top-left':(x, y), 'bottom-right':(m, n)}, where '(x, y)' and '(m, n)' signify the (row_id, column_id) of the top-left and bottom-right cells in the merged area. Using the shown table image, locate all merged cells and provide their coordinates in this format. Bear in mind that row and column IDs begin from 1.

This table does not contain any merged cells.