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  1. or download this
    no strict qw(refs);
my $variable = 'host_mail';
my ${ $variable } = '80.80.80.80';
  2. or download this
    no strict qw(refs subs);
my $variable = host_mail;
my ${ $variable } = '80.80.80.80';
  3. or download this
    my ${ host_mail } = '80.80.80.80';
  4. or download this
    my $scandal_topic = 'email';
say "We will call this scandal '${scandal_topic}gate'!";
# says "We will call this scandal 'emailgate'!";
  5. or download this
    my $scandal_topic = 'email';
say "We will call this scandal '$scandal_topicgate'!";
# dies "Global symbol "$scandal_topicgate" requires explicit package n
+ame