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CSS - How to stack divs by columns of 2

I have a variable number div that should appear on two lines, as shown below.

[1]  [3]  [5]  [7]

[2]  [4]  [6]  ...

I looked at the property column-count, but this is not exactly what I need, since it fixes the number of columns, whereas in my case it should be dynamic. (what I need would be a similar property of the count string, which apparently does not exist).

Is there a pure CSS solution, or should I make div containers for each group of two vertical divs?

Thank,

Edit: Here is a simplified code of my case. In fact, How do I set a property heightin my div container, should shared articles be stacked by no more than 2? Now they are overflowing the container.

<html>
<head>
<link rel="stylesheet" type="text/css" href="test.css">
</head>
<body>
<div class="container">
<div class="article">A</div>
<div class="article">B</div>
<div class="article">C</div>
<div class="article">D</div>
<div class="article">E</div>
</div>
</body>
</html>

and CSS

.article {
width:50px;
height:50px;
border:1px gray dashed;
margin:1px;
}

.container {
height:110px;
max-height:110px;
}

divs .

+4
5

, flexbox flex-direction: column; .

:

*
{
  box-sizing: border-box
}
.flex-parent
{
  display: flex;
  flex-flow: column wrap;
  /* this indicates, when a new "column" will be started */
  height: 200px;
  align-content: flex-start;
}
.flex-parent .col
{
  flex: 0 0 auto;
  width: 100px;
  height: 50px;
  background-color: silver;
  margin: 4px;
}
<div class="flex-parent">
  <div class="col">1</div>
  <div class="col">2</div>
  <div class="col">3</div>
  <div class="col">4</div>
  <div class="col">5</div>
  <div class="col">6</div>
  <div class="col">7</div>
  <div class="col">8</div>
  <div class="col">10</div>
  <div class="col">11</div>
  <div class="col">12</div>
</div>
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+2

columns css :

#columns-holder {
  -moz-columns: 100px;
  -webkit-columns: 100px;
  columns: 100px;
  -moz-column-gap: 15px;
  -webkit-column-gap: 15px;
  column-gap: 15px;
}
.box {
  width: 100px;
  height: 100px;
  margin-bottom: 15px;
  background: grey;
  -webkit-column-break-inside: avoid;
  page-break-inside: avoid;
  break-inside: avoid;
}
<div id="columns-holder">
  <div class="box">1</div>
  <div class="box">2</div>
  <div class="box">3</div>
  <div class="box">4</div>
  <div class="box">5</div>
  <div class="box">6</div>
  <div class="box">7</div>
  <div class="box">8</div>
  <div class="box">9</div>
  <div class="box">10</div>
</div>
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+3

- , float , div, :

.divclass{
    float: left;
    margin: 10px;
    width: 300px;
}

float divs:

<br stytle="clear: both;">

div, , - . , div . , .

+1

, 4 .

.container , . vw .

widht:22%;?
: 25% , 4 ? 4x25 = 100.
: , . 23% 22%, 22%.
. , .
box-sizing: borderbox. 0 margin 0 padding ( ) 25%. .

.container {
  width: 50vw;
  border: 5px solid pink;
}
.container .item {
  display: inline-block;
  border: 2px solid firebrick;
  width: 22%;
  height: 50px;
}
<div class="container">
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
  <div class="item"></div>
</div>
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0

Column-count

<ul>
    <li>A</li>
    <li>B</li>
    <li>C</li>
    <li>D</li>
<ul>

CSS:

ul {
    -moz-column-count: 2;
    -moz-column-gap: 20px;
    -webkit-column-count: 2;
    -webkit-column-gap: 20px;
    column-count: 2;
    column-gap: 20px;
}

Another option is CSS3, as shown below: A CSS3 solution would look like this:

HTML

<div id="wrap">
    <div class="list_item">A</div>
    <div class="list_item">B</div>
    <div class="list_item">C</div>
    <div class="list_item">D</div>
    <div class="list_item">E</div>
    <div class="list_item">F</div>
    <div class="list_item">G</div>
    <div class="list_item">H</div>
</div>

CSS

.list_item {
    float: left;
    margin: 5px;
    padding: 5px;
    width: 200px;
    border: 1px solid gray;
}
#wrap {
    width:460px;
    column-count:2;
    column-gap:20px;
    -moz-column-count:2;
    -moz-column-gap:20px;
    -webkit-column-count:2;
    -webkit-column-gap:20px;
}

You can see more details on here.

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