.PS
  circle fill; move; circle fill 0.4; move; circle fill 0.9
  {"\small\tt circle fill; move; circle fill 0.4; move; circle fill 0.9" \
      wid 4.25 at 2nd circle.s+(0,-0.15) }
  move to 0,-1
  box color "yellow"; arrow color "cyan"; circle shaded "green" outline "black"
  "\small\tt box color \"yellow\"; arrow color \"cyan\";
 circle shaded \"green\" outline \"black\"" wid 5.7 \
  at last arrow.end+(0,-0.5)
.PE
