Not only do specials have a pattern, but shield grass has one too. It's hard to explain - just use the map editor to figure it out. This is helpful for a couple reasons. It helps you to decide which plains squares to transform to grass and ensure that you always get shield grass.
The other reason it is helpful is for uncovering specials. Unlike the shield grass pattern, the specials pattern is not always complete, i.e. sometimes there is no special where one could possibly fit in the pattern. However, if you find a shield grass square outside of the shield grass pattern and the square fits the specials pattern, then you can mine or transform the shield grass square and you'll always get a special (forest or hill).
The other reason it is helpful is for uncovering specials. Unlike the shield grass pattern, the specials pattern is not always complete, i.e. sometimes there is no special where one could possibly fit in the pattern. However, if you find a shield grass square outside of the shield grass pattern and the square fits the specials pattern, then you can mine or transform the shield grass square and you'll always get a special (forest or hill).
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