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  • $\begingroup$ Excellent (+1) but this code gives ambiguous output when a list contains repeated entries in the intersection. (Admittedly, the OP precludes such cases.) $\endgroup$ Commented Mar 22, 2018 at 2:14
  • $\begingroup$ @kglr Thanks for your input. $\endgroup$ Commented Mar 22, 2018 at 2:19
  • $\begingroup$ @DavidG.Stork, thank you for the vote. For the repeated entries case, you can SplitBy the index set before applying Mod. $\endgroup$ Commented Mar 22, 2018 at 2:26
  • $\begingroup$ @qahtah, my pleasure. $\endgroup$ Commented Mar 22, 2018 at 2:27