FEA

The larger the value of (E + P) / N then the more complex the directed graph is, where
The value of (E + P  N) / N varies between 0 and N. A stricly layered architecture will have a value of 0.
The sum of (E + P  N) is 8, sum of (E + P  N) / N is 1.27.
Section  N  E + P  N  (E + P  N) / N 

FEA  6  4  0.67 
Top level  3  1  0.33 
Linear::Algebra  11  3  0.27 
FEA::Core  4  0  0.00 
FEA::Core::Elements  50  0  0.00 
FEA::Core::Factory  2  0  0.00 
FEA::Core::Fields  17  0  0.00 
FEA::Core::Integration  2  0  0.00 
FEA::Equations  7  0  0.00 
FEA::FileIO  9  0  0.00 
FEA::LinearSystem  2  0  0.00 
FEA::Mesh  2  0  0.00 
FEA::Solver  2  0  0.00 
Linear  3  0  0.00 
Linear::FileIO  4  0  0.00 
Linear::Solvers  52  0  0.00 
Tests  4  0  0.00 
Tests::App  8  0  0.00 
Tests::Classes  16  0  0.00 
Tests::Linear  3  0  0.00 
Tests::Utils  1  0  0.00 