        When she had finished, she stepped back from what she had drawn, to give him a chance to look at it.  It was a fairly simple series of pictograms, showing the sun rising above the water.  Next to it, she had drawn a sketch of a closed stylized U, which clearly matched the golden mark on her flank.  Next to that, she had drawn twenty-eight marks in the sand, much like the hash marks he was familiar with, although they were grouped in sixes instead of fives.  He interpreted this as meaning that she would be coming back at sunrise in twenty-eight days.