Table:
Even/odd Z, N (Hydrogen-1 included as OE)

p,n
EE
OO
EO
OE
Total

Stable
147
5
53
48
253

Long-lived
21
4
3
5
33

All primordial
168
9
56
53
286

How many rows and columns does this table have? Output the final answer as JSON in the format {"row_number": "m", "column_number": "n"}.

There are 4 rows and 6 columns in the table. So, the final answer is {"row_number": "4", "column_number": "6"}.