How to create a hole in a hexagonal body using MOSES software

Hi everyone. I am a student trying to figure out how to create a hole in the middle of the cylinder for my school project. I tried many ways but the program wouldn't run. Please advice on my mistake. 

&dimen  -save -dimen meters m-tons
&DESCRIBE body BUOY

pgen B -perm 1.0  -loc 0 0 0 0 0 90 -diftype 3ddiff
plane    -7.00    -cart    4.0474    0    \
            4.0475    6.49
plane    0.00    -cart    8.095    0    \
            8.095    6.49
plane    7.00    -cart    4.0475    0    \
            4.0475    6.49
end pgen
pgen C -perm 0.0 -loc 0 0 0 0 -90 0 -diftype strip
plane 0    6.49    -circ    0    0    1.82    0    5    72    
end pgen

I want to make hole pgen C inside pgen B, please i need advice