<https://investorplace.com/2018/03/best-etfs-for-2018-the-powershares-qqq-etf-stumbles/>
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<https://investorplace.com/2018/03/best-etfs-for-2018-the-powershares-qqq-etf-stumbles/>
<https://investorplace.com/2018/03/best-etfs-for-2018-the-powershares-qqq-etf-stumbles/>