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mathcastles reference

Variant of Biomes 73 and 72 — blackletter O/X + castle 城

Combines the blackletter tic-tac-toe motif of Biome 73 (𝕺 = O, 𝖃 = X) with the 城 castle character of Biome 72. May represent a chess-castle/rook element within the noughts-and-crosses sequence, or be a third variation in the same family.