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Green This block-metadata combination can be encountered in regular survival gameplay without exploiting glitches.
Blue This block-metadata combination can be encountered in Creative mode without using commands or exploiting glitches.
Yellow This block-metadata combination cannot be encountered normally and requires commands such as /setblock to see.
Red This block-metadata combination cannot be encountered normally even with commands, and requires a map editor to be able to see.
Black Any attempt to see this block-metadata combination at all will result in a game crash.
Gray The behavior of this block-metadata combination is currently unknown.
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