1
/|\
/ | \
/ | \
D / A | B \
/ | \
/ 5 \ 12
/ / \ \ /|\
13 <=--2 9---6 3-------11 | 13--==> 2
\ \ / / \|/
\ 7 / 14
E \ | /
\ | /
\ | /
\ | /
\|/
4
Figure 1 4-cycle separator
/-------------------\
1------2 \
/ / \ |
/ 8 \ 10
/ /| \ / |
6------7 | 3--------11 |
\ \| / \ |
\ 9 / 12
\ \ / |
5------4 /
\-------------------/
Figure 2 6-cycle separator