_____________________________
| /// | 4+2 | // | 2+4 6
| \\ | | \\\ |
_________________________________
| /// | 3+1 | / | 1+3 4
| \ | | \\\ |
_________________________________
| /// | 3+5 | ///// | 5+3
| \\\\\ | | \\\ | 8
______________ _____________________
| / | 1+4 | //// | 4+1
| \\\\ | | \ | 5
_____________________________________