This problem requires more test cases. My solution as many others would fail for a case in which the searched substring is not ordered.
Get the area codes from a list of phone numbers
Better bullseye matrix
Convert a numerical matrix into a cell array of strings
Matrix with different incremental runs
Matrix multiplication across rows
row-th maximum row elements
remove single elements
all possible subsets of set
Calculate the h-index
Integer sequence - 2 : Kolakoski sequence
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