Table:
cancer group
average number of cases per year
annual incidence rate
percent (%) of childhood cancer cases

all cancers
905
161
100

leukemias
292
52
32

cns tumours
173
31
19

lymphomas
100
18
11

neuroblastomas
71
13
8

soft tissue sarcomas
59
10
6

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.