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html - correct semantics for ul in ul

I am writing ul inside ul to make a accordion type of menu. But when I check my code below in html validator it gives me these errors

Element ul not allowed as child of element ul in this context. (Suppressing further errors from this subtree.)

How can I write semantically correct html for ul in this case?

Here is my html

<nav class="row">
            <ul class="menu">
                <li>
                    <a href="">Uutiset</a>
                </li>
                <ul class="inside">
                    <li><a href="">Fringilla Condimentum</a></li>
                    <li><a href="">Lorem</a></li>
                    <li><a href="">Fringillau</a></li>
                    <li><a href="">Curabitur</a></li>
                    <li><a href="">Mollis</a></li>
                    <li><a href="">Ipsum</a></li>
                    <li><a href="">Lorem</a></li>
                    <li><a href="">Fringillau</a></li>
                    <li><a href="">Curabitur</a></li>
                    <li><a href="">Mollis</a></li>
                    <li><a href="">Ipsum</a></li>
                </ul>
                <li><a href="">Foorumi</a></li>
                <li><a href="">Kauppa</a></li>
                <li><a href="">Messut</a></li>
                <li>
                    <a href="">Asiakaspalvelu</a>
                </li>
                <ul class="inside">
                    <li><a href="">Tilaa lehti</a></li>
                    <li><a href="">Muutos tilaukseen</a></li>
                    <li><a href="">L?het? uutisvinkki</a></li>
                    <li><a href="">Anna palautetta</a></li>
                </ul>
                <li><a href="">Nakoislehti</a></li>
                <li><a href="">Nae meidat</a></li>
            </ul>
        </nav>
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You must wrap every inner ULs with an LI, i.e.

<ul class="menu">
    <li>
        <a href="">Uutiset</a>
    </li>
    <li> <----
        <ul class="inside">
            <li><a href="">Fringilla Condimentum</a></li>
            <li><a href="">Lorem</a></li>
        </ul>
    </li> <----
 </ul>      

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