SVG buildism icon

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Code:

<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
  <rect x="1.5" y="1.5" width="30" height="30" style="stroke: #000000; stroke-width: 1; fill: #aaaaaa;" />
<text x="2.5" y="27"  style="stroke: none; fill: #8888aa; font-family: Arial; font-size: 30px; font-style: italic; font-weight: bold;" >B</text>
<text x="4.5" y="27"  style="stroke: none; fill: #333377; font-family: Arial; font-size: 30px; font-style: italic; font-weight: bold;" >B</text>
<text x="6.5" y="27"  style="stroke: none; fill: #000055; font-family: Arial; font-size: 30px; font-style: italic; font-weight: bold;" >B</text>
</svg>