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Prefix of the given size or Nothing if the size exceeds the length of the string.

Suffix of the given size or Nothing if the size exceeds the length of the string.

All substrings of the given size.

Shape of the string. All lower-case characters are mapped to l, upper-case characters to u, digits to d and rest of characters to x.

Pack the string, that is remove all adjacent repetitions, for example aabcccdde -> abcde.