patterns
_|_ _|_ _|_ _|_ _|_ _|_ _|_ _|_ _|_
| | | | | | | | |
_|_ _|_ _|_ _|_ _|_ _|_ _|_ _|_ _|
| | | | | | | | |
_|_ _|_ _|_ _|_ _|_ _|_ _|_ _|_ _|_
| | | | | | | | |
_|_ _|_ _|_ _|_ _|_ _|_ _|_ _|_ _|
| | | | | | | | |
_|_ _|_ _|_ _|_ _|_ _|_ _|_ _|_ _|_
| | | | | | | | |
_|_ _|_ _|_ _|_ _|_ _|_ _|_ _|_ _|
| | | | | | | | |
_|_ _|_ _|_ _|_ _|_ _|_ _|_ _|_ _|_
| | | | | | | | |
_|_ _|_ _|_ _|_ _|_ _|_ _|_ _|_ _|
| | | | | | | | |
_|_ _|_ _|_ _|_ _|_ _|_ _|_ _|_ _|_
| | | | | | | | |
_|_ _|_ _|_ _|_ _|_ _|_ _|_ _|_ _|
| | | | | | | | |
_|_ _|_ _|_ _|_ _|_ _|_ _|_ _|_ _|_
| | | | | | | | |
