The fourth line (i.e. the first line, in fact) is consumed by -n. See perlrun - how to execute the Perl interpreter.
لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re^3: command line perl reading from STDIN by choroba
in thread command line perl reading from STDIN by perlhappy

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