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  1. or download this
    "foo" . '_' . 123
$abc . '_' . 123
"foo" . '_' . $num
  2. or download this
    "$abc . _ . 123"
"foo . _ . $num"
  3. or download this
    "${abc}_$_"            # 1
$abc . '_' . $_        # 2
join('_', $abc, $_)    # 3
"$abc\_.$_"            # 4
$abc . "_$_"           # 5