I think I'll do it this way:
1) Base and upgrade in blue, and alt-upgrade in green (option for jungles or islands).
2) Base and upgrade in yellow, and alt-upgrade in green or red (option for the desert).
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I think I'll do it this way:
1) Base and upgrade in blue, and alt-upgrade in green (option for jungles or islands).
2) Base and upgrade in yellow, and alt-upgrade in green or red (option for the desert).