Hypermapped Virtual World Query II

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To find associations of two objects 'a' and 'b' from the 3 time slices of a hypermapped virtual world R the query in mathematical notation is: Sx (x1o, x2o) (St (t1, t2, t3) R)

In SQL-like language the query can be expressed as:

SELECT     x
CLUSTER    OPEN x1, OPEN x2
FROM  SELECT     t
      CLUSTER    t1, t2, t3
      FROM       R