types/src/main/java/com/google/common/html/types/SafeStyleSheets.java
public static SafeStyleSheet concat(Iterable<SafeStyleSheet> stylesheets) {
    int concatLength = 0;
    for (SafeStyleSheet stylesheet : stylesheets) {
      concatLength += stylesheet.getSafeStyleSheetString().length();
    }

    StringBuilder result = new StringBuilder(concatLength);
    for (SafeStyleSheet stylesheet : stylesheets) {
      result.append(stylesheet.getSafeStyleSheetString());
    }
    return create(result.toString());
  }
public static SafeStyleSheet concat(Iterable<SafeStyleSheet> stylesheets) {
    int concatLength = 0;
    for (SafeStyleSheet stylesheet : stylesheets) {
      concatLength += stylesheet.getSafeStyleSheetString().length();
    }

    StringBuilder result = new StringBuilder(concatLength);
    for (SafeStyleSheet stylesheet : stylesheets) {
      result.append(stylesheet.getSafeStyleSheetString());
    }
    return create(result.toString());
  }
Creates a new SafeStyleSheet which contains, in order, the string representations of the given
{@code stylesheets}.