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  1. or download this
    if (/$hash{$whatever}/) {
    do something;
}
  2. or download this
    %SampleHash (
    'whatever' => 'whatever',
    'whoever' => 'whoever',
)
  3. or download this
    if($SampleHash{$string}){ ... }
  4. or download this
    foreach(LIST) {
    $checked{$_}++;
}

if($checked{$string}) { ... }
  5. or download this
    @checked{LIST} = ();

if(exists $check{$string}) { ... }