This variation is done using four parallel lines.
The first stitch is started at the same point as the starting point on the third line.
The needle comes out at a point lower than the earlier point on the second line.
The second stitch is done by putting the needle at the same point as the point on the second line, on the fourth line.
The needle comes out at a lower point on the third point.
This is how the stitch will look when done.
The thread is fixed on the leftmost line.
The next stitch is done at the same point on the second line and brought out at a lower level on the second line.
This continues till the fourth line in the right.
Then we move step by step to the left.
This will be the final look of the stitch.