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relation_table<-match
relation_table <-match: pattern=vector -> associations=chain
Return a new chain with rows (vector objects) matching the argument vector. A row is supposed to match iff

  1. The vectors have the same range of elements
  2. All elements are pairwise equal or the argument vector has @default for each index they are not pairwise equal.

    This method exploits the available indexing relation_table<-tables. See also relation_table<-vectors.

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