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  1. or download this
    BEGIN { require module }
  2. or download this
    BEGIN {
  my $version = (($0 =~ /2(?:\.pl)?$/) ? '2' : '');
  require "LayerB${version}.pm";
}
  3. or download this
    BEGIN {
   # set $version based on $0
  require "LayerB${version}.pm";
  "LayerB${version}"->import(qw(A B C));
}