Table:
flow
non-financial corporations sector
household sector
financial corporations sector

actual employer social contributions
-25
+25

imputed employer social contributions
-25
+25

property income received

+5
-5

current transfers

-75
75

current transfers

+20
-20

household disposable income

-55

change in pension entitlements

55
-55

In tables, merged cells are often found and we can denote them as JSON {'top-left':(R1, C1), 'bottom-right':(R2, C2)}, with '(R1, C1)' and '(R2, C2)' indicating the (row_id, column_id) of the top-left and bottom-right cells of the merged region. Please scan the table image provided, find all occurrences of merged cells, and return their coordinates in the stated format. It's important to remember that row and column IDs begin from 1.

This table does not contain any merged cells.