This problem requires more test cases. My solution as many others would fail for a case in which the searched substring is not ordered.
Add two numbers
Remove the vowels
Project Euler: Problem 10, Sum of Primes
02 - Vector Variables 4
Polite numbers. Politeness.
Graph Algorithms - 2 : Chromatic Number
Mongean Shuffle : 2
birthday on same day of week
Graph Algorithms 3: Number of Connected Components
Integer Sequence - 1
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