There are many ways to do that. For example, like this:
First lemming digs down 7-9 pixels, and then blocks. When the lemming is made into a blocker there should be aother lemming on top of it. That should force the second lemming to be on the right side of the blocker. The third lemming digs down 5 pixels pretty close to the blocker and then bashes. The second one (trapped to the right of the blocker) digs 1 or 2 pixels and then bashes to the left.
To view wingdings I select the wingdings part, right click on it, and then click "view selection source".