Click a piece that looks like a human face viewed from the side.  The right side of this shape is a perfect vertical line.  The left side of the shape has peaks and points for a nose, lips, etc. Click a piece that has a square on the far-right side, and then on the left, there is a flat horizontal arm with some pointed bits
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Keep that piece, but start paying attention.  Click a boat that has a big upward-pointing arrow on top of it.  Do not touch anything else