PetscDualSpace Object: 1 MPI process
  type: sum
  Dual space with 2 components, size 12
  Sum dual space of 2 subspaces
    PetscDualSpace Object: H1 1 MPI process
      type: sum
      Dual space with 2 components, size 8
      Sum dual space of 2 concatenated subspaces (all identical)
        PetscDualSpace Object: H1 1 MPI process
          type: lagrange
          Dual space with 1 components, size 4
          Continuous tensor Lagrange dual space
    PetscDualSpace Object: Hdiv 1 MPI process
      type: lagrange
      Dual space for 1-forms (stored in dual form) with 2 components, size 4
      Continuous tensor trimmed Lagrange dual space
  Quadrature on a unknown of order -1 on 8 points (dim 2)
Mat Object: Joint dual space projection matrix 1 MPI process
  type: seqaij
row 0: (8, 0.)  (9, -1.) 
row 1: (10, 1.)  (11, 0.) 
row 2: (12, 0.)  (13, 1.) 
row 3: (14, -1.)  (15, 0.) 
row 4: (0, 1.) 
row 5: (1, 1.) 
row 6: (2, 1.) 
row 7: (3, 1.) 
row 8: (4, 1.) 
row 9: (5, 1.) 
row 10: (6, 1.) 
row 11: (7, 1.)