patterns

_|_     _|_     _|_     _|_     _|_     _|_     _|_     _|_     _|_   
 |       |       |       |       |       |       |       |       |    
    _|_     _|_     _|_     _|_     _|_     _|_     _|_     _|_     _|
     |       |       |       |       |       |       |       |       |
_|_     _|_     _|_     _|_     _|_     _|_     _|_     _|_     _|_   
 |       |       |       |       |       |       |       |       |    
    _|_     _|_     _|_     _|_     _|_     _|_     _|_     _|_     _|
     |       |       |       |       |       |       |       |       |
_|_     _|_     _|_     _|_     _|_     _|_     _|_     _|_     _|_   
 |       |       |       |       |       |       |       |       |    
    _|_     _|_     _|_     _|_     _|_     _|_     _|_     _|_     _|
     |       |       |       |       |       |       |       |       |
_|_     _|_     _|_     _|_     _|_     _|_     _|_     _|_     _|_   
 |       |       |       |       |       |       |       |       |    
    _|_     _|_     _|_     _|_     _|_     _|_     _|_     _|_     _|
     |       |       |       |       |       |       |       |       |
_|_     _|_     _|_     _|_     _|_     _|_     _|_     _|_     _|_   
 |       |       |       |       |       |       |       |       |    
    _|_     _|_     _|_     _|_     _|_     _|_     _|_     _|_     _|
     |       |       |       |       |       |       |       |       |
_|_     _|_     _|_     _|_     _|_     _|_     _|_     _|_     _|_   
 |       |       |       |       |       |       |       |       |