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  LinearSolver: {
        Solver:              CG                     //other options include MUMPS (direct solver, faster for less than 32 CPUs) if it is compiled in
        Preconditioner:	  CHOLESKY       //other options include DIAGONAL
        PrintFrequency:      50                //if you want print solver convergence history
        QuietMode:              1	        //Set it to 1 if you do not want to print anything
        Tolerance:           1e-10            //relative tolerance
        MaxIterations:       3000            //maxima number of iterations before CG quits
  }