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C:\test>1169736-st.pl
[
...
  ["N"],
  ["C"],
]

[
  bless({ A => undef, C => undef, D => undef, E => undef, H => undef, 
+J => undef, L => undef, N => undef, S => undef, Z => undef }, "Set::T
+iny"),
...
  bless({ N => undef }, "Set::Tiny"),
  bless({ C => undef }, "Set::Tiny"),
]

[
  ["S", "N", "H", "A", "C", "J", "D", "E", "Z", "L"],
...
  ["V", "D", "C"],
  ["P", "N", "Q"],
]