B4
|
x
|
x
|
x
|
x
|
|||
![]() |
x
|
x
|
x
|
x
|
|||
![]() |
|||||||
![]() |
x
|
x
|
x
|
x
|
x
|
||
![]() |
x
|
x
|
x
|
x
|
x
|