s='op'>=</span> <span class='st'>"continuous"</span><span class='op'>)</span>
<span class='va'>tickers</span> <span class='op'>&lt;-</span> <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span><span class='op'>(</span><span class='st'>"AMZN"</span>, <span class='st'>"ZM"</span>, <span class='st'>"UBER"</span>, <span class='st'>"NFLX"</span>, <span class='st'>"SHOP"</span>, <span class='st'>"FB"</span>, <span class='st'>"UPWK"</span><span class='op'>)</span>
<span class='va'>securities_return