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while (<DATA>) { chomp; warn "<$_>"; }
warn "One";
...
warn "Four";
__DATA__
Zero

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<Zero> at - line 1, <DATA> line 1.
One at - line 2, <DATA> line 1.
Two at - line 4, <DATA> line 123.
Three at - line 6.
Four at - line 8, <DATA> line 456.