How do the five flex items rank in proportion to two lines, and the second line shows only the first two?

the effect is as follows:

clipboard.png

there are three rows like this, and each flex item occupies 33.3333% of the principal axis space, so I divided two horizontal flex containers as the previous vertical flex item. Now the problem is how to arrange the first two flex items in line 2 (if the width of the flex item is not limited, I think it cannot be divisible). Now I add an empty flex item after the second line, and then enlarge it with flex:1. But with an empty div, ask the boss for advice on a better way.

Html css
Mar.31,2021 
<div class="row">
  <div class="col"></div>
  <div class="col"></div>
  <div class="col"></div>
  <div class="col"></div>
  <div class="col"></div>
</div>
<style>
  .row {
    width: 300px;
    display: flex;
    flex-wrap: wrap;
    align-content: flex-start;
  }
  .col{
    flex: 0 0 33.333333%;
    height: 80px;
    box-sizing: border-box;
    border: 1px solid -sharpdcdfe6;
  }
</style>

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