Original matrix
Mat Object: 1 MPI processes
  type: seqdense
row 0: (0, 1)  (5, 6) 
row 1: (1, 2)  (6, 7) 
row 2: (2, 3)  (7, 8) 
row 3: (3, 4)  (8, 9) 
row 4: (4, 5)  (9, 10) 
row 5:
row 6:
row 7:
row 8:
row 9:
Submatrices
Mat Object: 1 MPI processes
  type: seqdense
row 0: (3, 8) 
row 1: (4, 9) 
row 2: (0, 5) 
Original zeroed matrix
Mat Object: 1 MPI processes
  type: seqdense
row 0:
row 1:
row 2:
row 3:
row 4:
row 5:
row 6:
row 7:
row 8:
row 9:
