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  [[20XAAR03[120X]  [16XAlbert,  M.  H., Atkinson, M. D. and Ru\v{s}kuc, N.[116X, [17XRegular closed
  sets of permutations[117X, [18XTheoretical Computer Science[118X, [19X306[119X (2003), 85 - 100.
  
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  [[20XHL13[120X]  [16XHoffmann,  R.  and Linton, S.[116X, [17XRegular Languages of Plus- and Minus-
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  [[20XUY00[120X]  [16XUno,  T.  and  Yagiura,  M.[116X, [17XFast Algorithms to Enumerate All Common
  Intervals of Two Permutations[117X, [18XAlgorithmica[118X, [19X26[119X (2000), 2000.
  
  
  
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