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    $\begingroup$ The tetrominoes labelled L and S are not double; they are mirror image versions of each other. $\endgroup$
    – Acccumulation
    Commented Oct 16, 2020 at 17:05
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    $\begingroup$ @Acccumulation Since the rules stipulate that "Pieces may be rotated or reflected", to all intents and purposes similar-lettered tetrominoes are entirely interchangeable. Their depiction is purely for symmetry and aesthetics :) $\endgroup$
    – Stiv
    Commented Oct 16, 2020 at 17:11