* Repeating letters: The word "springtime" has some repeated letters ("i" and "n").
* Different word lengths: We need to count words of all possible lengths (from 2 letters to 10 letters).
This gets tricky quickly. Here's why we can't just give you a simple number:
* Dictionary vs. Non-Dictionary: Do we want to count only real words (from a dictionary) or any combination of letters?
* Scrabble rules: Do we want to follow Scrabble rules (like proper nouns are not allowed)?
How to approach it:
1. List all possible letters: s, p, r, i, n, g, t, m, e
2. Start with short words: Find all 2-letter words, then 3-letter words, and so on.
3. Consider repeating letters: Remember that "in" and "ni" are different words.
It's a great exercise to do yourself! Let me know if you'd like to work through some of the shorter word lengths together.