Write it, run it, read the output

This is a scratch drill — your code runs, nothing is graded or recorded. No test cases, no expected output, no verdict.

TASK

Calculate and store the three row sums and four column sums for the matrix. Print them in order, then verify that the row sums and the column sums each combine to 17.

Row sums: 8 4 5
Column sums: 10 5 2 0
Combined row sums: 17
Combined column sums: 17