| node at upstream end of upstream element | upstream elements | NODE externals |
downstream elements | node at downstream end of downstream element |
| NODE_1
E SALE_1 |
B B_1 T PIPE_1 |
NODE_5 NODE_2 |
||
| NODE_1 |
T PIPE_1 |
NODE_2 | T PIPE_2 B B_2 |
NODE_3 NODE_6 |
| NODE_2 |
T PIPE_2 |
NODE_3 | T PIPE_3 B B_3 |
NODE_4 NODE_7 |
| NODE_3 |
T PIPE_3 |
NODE_4
E SALE_2 |
B B_4 |
NODE_8 |
| NODE_1 |
B B_1 |
NODE_5 | T PIPE_4 | NODE_6 |
| NODE_2 NODE_5 |
B B_2 T PIPE_4 |
NODE_6 | ||
| NODE_3 |
B B_3 |
NODE_7 | T PIPE_5 | NODE_8 |
| NODE_4 NODE_7 |
B B_4 T PIPE_5 |
NODE_8 |