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#!/usr/bin/env python3
import json
import sys
def main(matrix):
# Calculate the size of the matrix
rows = len(matrix)
cols = len(matrix[0])
# Check that all columns are of equal length
for r in range(1, rows):
if len(matrix[r]) != cols:
raise ValueError(f'Row {r} has different number of columns')
print('[')
for r in range(rows-1):
# Compute each row
row = []
for c in range(cols-1):
row.append(matrix[r][c] + matrix[r][c+1] +
matrix[r+1][c] + matrix[r+1][c+1])
print(' ' + str(row) + ',')
print(']')
if __name__ == '__main__':
# Read the input as JSON
main(json.loads(sys.argv[1]))
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