Default card images for Challenge decks (Human/AIExtras)

[rikimbo]

In a challenge deck file (such as those found in the res/quest/challenges folder), it is possible to specify which edition a card is from in the [main] section. For example, if I want four Mountains, specifically from M10:

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[main]
4 Mountain|M10


However, I'm wondering how the edition is selected for cards specified in HumanExtras and AIExtras. For example, in the challenge deck "Private Domain.dck":

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HumanExtras=Strip Mine
AIExtras=Plains|Island|Mountain|Swamp|Forest


How does Forge determine which edition those cards will be from? Is it possible to specify which edition I want the cards to be from? The separator character that is used to separate the cards in that list is the same as the one used to specify editions in the [main] area.