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  • $\begingroup$ "Period" and "Period ID" are just examples. In the general case, the strings may have nothing in common. $\endgroup$
    – user13892
    Commented Jun 16 at 5:37
  • $\begingroup$ @user13892 I guess I was confused. See update. $\endgroup$
    – lericr
    Commented Jun 16 at 15:49