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Triple rot13 (like Triple DES) is government approved.

    echo -n word | \
    > wm --rot13 --words stdin | \
    > wm --rot13 --words stdin | \
    > wm --rot13 --words stdin    

    result: jbeq

However, the result is the same as a single round.

    echo -n word | wm --rot13 --words stdin

    result: jbeq