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   1  @mixin box-shadow($shadow...) {
   2    @if $enable-shadows {
   3      $result: ();
   4  
   5      @each $value in $shadow {
   6        @if $value != null {
   7          $result: append($result, $value, "comma");
   8        }
   9        @if $value == none and length($shadow) > 1 {
  10          @warn "The keyword 'none' must be used as a single argument.";
  11        }
  12      }
  13  
  14      @if (length($result) > 0) {
  15        box-shadow: $result;
  16      }
  17    }
  18  }