Mat Object: 1 MPI processes
  type: seqaij
row 0:
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row 3: (0, 1.) 
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row 7: (1, 1.) 
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row 11: (2, 1.) 
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row 17: (3, 1.) 
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row 23: (4, 1.) 
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row 27: (5, 1.) 
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row 35: (6, 1.) 
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row 41: (7, 1.) 
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row 47: (8, 1.) 
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