I'd noticed your solution doesn't return occurence in proper order so I extended test suite. Sorry
Due to the upgrade of test suite your solution doesn't work anymore. Sorry.
Remove the vowels
Implement a ROT13 cipher
Back to basics 11 - Max Integer
Generate a string like abbcccddddeeeee
Replace multiples of 5 with NaN
(Linear) Recurrence Equations - Generalised Fibonacci-like sequences
Modify subscripts - easier
Optimum Egyptian Fractions
Alternative Scoring. Create an incremental spiral.
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