Command in the [TclX] pacakge to return the logical intersection of two lists. The returned list will be sorted.

Usage:
    :   '''intersect''' ''lista listb''

Example:
  package require Tclx
  intersect {a b c d e} {d e d f g c} ;# ==> c d e

----
This functionality exists in [tcllib] in the [struct::set] package.


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