Ooops my diagram of the nets was incorrect.
Quite ironic seeing as i struggled in the test!!
So here goes again :-
(Ignore the 0's Just there for spacing. hope it makes sense!)
1) cross pattern
0*0
***
0*0
0*0
2) Snake pattern
000*
****
*000
3) More complex pattern ( cant remember exactly)
00*
***
**0