Author: mrw
Draw few loop along the gridlines in the diagram. The numbers in each cell indicate how many of that cell's edges are used by the loops. Cells which are inside the loops should form the all elements from given pentomino set which can't touch each other even in a point.
Grid control: To draw a fence click at the cell edge or move mouse along the line holding the button. You can also put auxiliary marks by clicking at cells and click on the given figures to mark them out. More details about grid control are at the help page.