I could solve 5 of them.
UPDATE: read some solutions. So you accept
mine for 3 and 4. Quiestion 10 is really trickey.
UPDATE: please someone explain why my solution to 8 works. I don't understand. Thx.
UPDATE: I still don't know how my solution to 8 works, I've found it accidentally, but I see that there's a similar solution using $^N. (And one even with $1, wow!) (The official solution which uses $| is eaasier to understand.)
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