<p class="one">문단입니다.</p>
  <p class="two">문단입니다.</p>
  <p class="three yellow">문단입니다.</p>
  
  <p class="four red">문단입니다.</p>
  
  <!-- 유일하게 조합 할 수있는 것은 class!! -->
  <p class="one two three">문단입니다.</p>
    .one { color: blue; }
    .two { text-decoration: underline; }
    .three { font-style: italic; }

    .four {

      color: blue;
      text-decoration: underline;

    }

    .red { color: red; }
    .blue { color: blue; }
    .yellow { color: yellow; }

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