Here's a puzzle.  Write a short phrase to generate the character list
'0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'

Some proposed solutions are:

   a.#~2|i.&0"1 a./:@,"0 _'09AZaz'

   a.#~~:/"1(i.256)</a.i.'0:A[a{'

   a.{~I.2|I.48 10 7 26 6 26

But I can't believe there isn't something shorter than that.

Ambrus
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