L4

Start from ;
close into a 2x3 rectangle with two stacks of two tiles (south);
close vertically (180 degrees) into a 1x3 rectangle with a stack of four tiles (south) and two stacks of two tiles;
separate the four stacked tiles in two pairs of two stacked tiles by rotating each pair 90 degrees (in opposite directions);
turn 180 degrees a pair of adjacent tiles (one from each of the two pairs of stacked tiles);
close into the final shape (turn 90 degrees two pairs of two adjacent tiles).