1x 
== 1x 
1x  |
 |
1x 
1x  |
 |
| 1x
.. 1x  |
 |
1x 
1x |
 |
1x 
1x  |
 |
1x
1x  |
 |
1x
1x  |
 |
1x
1x  |
 |
1x 
.. 1x  |
 |
1x 
1x  |
 |
| 1x
.. 1x  (cross
hole, not round) |
 |
2x
1x  |
 |
1x 
1x  |
 |
2x 
.. (colors don't matter) |
 |
1x
2x 
.. 4x |
 |
|
+ |
 |
| 1x
2x
.. 2x |
 |
|
+ |
 |
4x 
1x |
 |
