def Precon bool 0
def Solver bool 0
def SeqGs bool 0
def SeqSOR bool 0
def CGSolver bool 0
def BiCGSTABSolver bool 0
def LoopSolver bool 0
def GradientSolver bool 0
def Pre [:6]
def Post [:6]
def Cells [:1]
ct SeqGs -> Precon
ct SeqSOR -> Precon
ct CGSolver -> Solver
ct BiCGSTABSolver -> Solver
ct LoopSolver -> Solver
ct GradientSolver -> Solver
ct (Pre + Post) > 0