<svg xmlns="http://www.w3.org/2000/svg">
  <!-- First row -->
  <g transform="translate(20,20)">
    <g>
      <rect width="15px" height="15px"/>
    </g>
    <g transform="translate(50,0)">
      <rect x="0" y="10" width="15px" height="15px"/>
    </g>
    <g transform="translate(100,0)">
      <rect x="9" y="10" width="15px" height="15px"/>
    </g>
  </g>
  <!-- Second row -->
  <g transform="translate(20,70)">
    <g>
      <rect x="22.5" y="10" width="15px" height="15px"/>
    </g>
    <g transform="translate(50,0)">
      <rect x="29.7" y="10" width="15px" height="15px"/>
    </g>
    <g transform="translate(100,0)">
      <rect x="45" y="30"  width="15px" height="15px"/>
    </g>
  </g>
  <!-- Third row -->
  <g transform="translate(20,120)">
    <g>
      <rect x="48" y="34" width="15px" height="15px"/>
    </g>
    <g transform="translate(50,0)">
      <rect x="60" y="50" width="15px" height="15px"/>
    </g>
    <g transform="translate(100,0)">
      <rect x="60" y="50" width="15px" height="15px"/>
    </g>
  </g>
</svg>