I really appreciate two tricks:

• s// /
  I understand this, and have used the empty expression before with m//, but never thought to try it with s///.
   
• for($/)x16
  A slick way of getting the newline (vis-à-vis -l print until...)!
  Changing the loop to for($_)x16 is informative.
  And, since a bare print prints both $_ and $/, I found it rather unobvious which variable holds the strings.

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