The conditions you have to meet are specific to the color-coded spaces. For example, if it provides a single number, every side of a tile in that space must add up to the number provided. It is possible – and common – for only half a tile to be within a color-coded space.
Enable it at: https://console.developers.google.com/apis/api/gmail.googleapis.com/overview?project=549352339482
，这一点在PDF资料中也有详细论述
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