53.

Flip the paper over.

Now, the paper has four quadrants. Try to imagine that the x-axis is attached to the edge of quadrant IV and the negative y-axis to the edge of quadrant III.

54.

Hold the negative y-axis (i.e., the edge of quadrant III) with two fingers and try to align it with the x-axis (i.e., the edge of quadrant IV).

If you do it correctly, then it will make two valley-folds and two mountain-folds shown on the left.