×Isolating the first plate's island (by dropping the trapdoors at (5,19) and (6,19)).
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×Directing an aumtlich from the trapdoor at (4,19) through the first two checkpoints to the first plate, by Beethro moving along the northern edge of the second plate's island.
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×Setting that up required having other aumtlich in the diagonal passage to block its southward movement; I needed other aumtlich for the second plate anyway, so that was no hardship.