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The number 24.20.3 is found on the billboard.
This site also mentions something called [[Operation Chip Sweep]], which led to another website, also apparently based in England.
== Hidden Numbers24.20.1 was also found on this site.24.20.3 was found on the billboard.24.20.4 was found on the [ flyer].
== Notes ==
* [ Operation Swamp 81] refers to an actual plainclothes police operation and related riots in Brixton in 1981. Operation Swamp 0000 seems to be named after this historical event.