Commands 
<Left mouse>Drag - move pattern to new location 
<Left mouse><Ctrl>Drag - move copy of pattern to new location. 
<Left mouse><Shift>Drag - resize pattern 
<Del> - delete pattern 
<Ins> - insert new pattern 
<Right mouse> - flip pattern 

By marks "X" are designated patterns, which cross current pattern 
By marks "O" are designated patterns which overlies current patterns, the overlappings patterns are forbidden.