3.2 A simple inertia dyadic for 1 particle
[  7.9706e-043 -3.9853e-043 -0            ] 
[ -3.9853e-043  1.9926e-043 -0            ] 
[ -0           -0            9.9632e-043  ] 

3.4 inertia dyadic for 4 particle around the origin
[  4            0            0            ] 
[  0            3            0            ] 
[  0            0            7            ] 

3.4 inertia dyadic for 4 particle around the center of mass
[  4             0             0             ] 
[  0             2.85714       0             ] 
[  0             0             6.85714       ]