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2 of 4
added 5 characters in body

16: Quarterstaff, 64

-1 is truthy,

.1......."a".......1.
   1->a[Hi, Retina!]
  ?[-124(.|>a)?]
49a!

Try it online!

the indentation doesn't do anything, by the way.

Satisfies:

  1. The first character is a ..
  2. It contains an e.
  3. Its length is even.
  4. Its length is a perfect square.
  5. It contains an a.
  6. It contains a > character.
  7. Contains the exact string ->.
  8. Contains the exact string Hi, Retina!.
  9. The sum of the first two Unicode code points is a multiple of 5.
  10. The 10-th character is a ".
  11. The last non-empty line does not have any duplicate characters.
  12. The first line is a palindrome of length > 5.
  13. The first line is exactly 21 characters long (not including newline).
  14. It contains a ?.
  15. It contains a |

For future answers:

  • The first character is a ..
  • Its length is an even perfect square.
  • Contains the exact sequence ->.
  • Contains the exact string Hi, Retina!.
  • The second character's Unicode code point, mod 5, is 4.
  • The 10-th character is a ".
  • The last non-empty line does not have any duplicate characters.
  • The first line is a palindrome of length = 21
  • It contains a ?.
  • It contains a |