div class block1 div class block1__item1 div div class block1__item1 d

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<div class="block1">
<div class="block1__item1"></div>
<div class="block1__item1"></div>
<div class="block1__item1"></div>
<div class="block1__item1 block1__item1_modificator1"></div>
<div calss="block2">
<div class="block2__item2">
<div class="block2__item3"></div>
<div class="block2__item3"></div>
</div>
<div class="block2__item2"></div>
</div>
</div>