This problem requires more test cases. My solution as many others would fail for a case in which the searched substring is not ordered.
Which values occur exactly three times?
Test for balanced parentheses
"Low : High - Low : High - Turn around " -- Create a subindices vector
How long is the longest prime diagonal?
01 - Scalar variables
Neither minima nor maxima
Graph Algorithms - 2 : Chromatic Number
Construct a precedence graph from a code segment
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