Page History

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1. Users A, B and C join team T.
   1. At this point, users A, B, C have authorisation <NAMESPACE>:group:T (in the sense of G002)
2. Team T joins groups X, Y
   1. At this point, users A, B, C have authorisation <NAMESPACE>:group:T  and <NAMESPACE>:group:X:T and <NAMESPACE>:group:Y:T
3. User C leaves T
   1. At this point, users A, B have authorisation <NAMESPACE>:group:T and <NAMESPACE>:group:X:T and <NAMESPACE>:group:Y:T
   2. At this point, user C has authorisation <NAMESPACE>:group:X  or <NAMESPACE>:group:Y  only if they have it by independent means (not through T)
4. T leaves Y and joins W
   1. At this point, users A, B have authorisation <NAMESPACE>:group:X:T and <NAMESPACE>:group:W:T in addition to <NAMESPACE>:group:T 
5. User D joins T
   1. At this point, users A, B, D have authorisation as in point 4

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