Since series 3 minifigures, Lego started using a raised dot system to indicate which figure is included in the package. The dots appear on the bottom edge of the back of the packages. Be careful when decoding these dots because sometimes abnormalities in the packaging can appear as additional bumps. When in doubt feel for unique pieces or purchase them individually from Firestar Toys.
The two lines in the middle represent the seams in the package.
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