I need to make a figure with shaded areas and I found this code proposed by
Hans. Why does the definition of the r path that Hans proposed give the
same result as what I propose ?
Thank you.

     path p, q, r ; pair z ;
     p := unitsquare scaled 4cm ;
     z := point 3.6 of p ;
     q := z--urcorner p ;
     r := z--urcorner p--lrcorner p--llcorner p--cycle ;
  %r := q -- reverse bottomboundary p -- cycle ; definition of Hans
     draw p ;
     draw r numberstriped (.25,10,5) withcolor magenta ;
     draw thetextext.llft("B", llcorner p) ;
     draw thetextext.lrt ("C", lrcorner p) ;
     draw thetextext.ulft("A", ulcorner p) ;
     draw thetextext.urt ("D", urcorner p) ;
     draw thetextext.lft ("M", z) ;
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