用flex布局实现元素多行显示

image.png
如图,类似如有9个子元素,第一行4个,第二行3,第三行2个这种用flex如何实现,不指定子元素的宽度

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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>demo</title>
    <style>
        .container {
            width: 150px;
            display: flex;
            flex-direction: column;
        }

        .row {
            display: flex;
            flex-direction: row;
        }

        .cell {
            width: 100%;
            height: 50px;
            background: yellow;
            border-color: red;
            border-style: dashed;
            border-width: 2px;
        }
    </style>
</head>

<body>
    <div class="container">
        <div class="row">
            <div class="cell"></div>
            <div class="cell"></div>
            <div class="cell"></div>
            <div class="cell"></div>
        </div>
        <div class="row">
            <div class="cell"></div>
            <div class="cell"></div>
            <div class="cell"></div>
        </div>
        <div class="row">
            <div class="cell"></div>
            <div class="cell"></div>
        </div>
    </div>
</body>

</html>
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