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 @a: 2;
 @x: @a * @a;
 @y: @x + 1;
 @z: @y + @x * 2;
 @m: @z % @y;
  
 @nice-blue: #5B83AD;
 @light-blue: @nice-blue + #111;
 
 @rgb-color: rgb(20%, 15%, 80%);
 @rgba-color: rgba(23,68,149,0.5);
  
 @b: @a * 10px;
 @c: #888;
 @fonts: "Trebuchet MS", Verdana, sans-serif;
  
 .variables {
   width: @z + 1cm; // 14cm
   height: @b + @x + 0px; // 24px
   margin-top: -@b; // -20px
   margin-bottom: 10 - -@b; // 30px
   @d: @c + #001;
   color: @d;
   background: @light-blue;
   font-family: @fonts;
   margin: @m + 0px; // 3px
   font: 10px/12px serif;
   font: 120%/120% serif;
 }
 
 .external {
   color: @c;
   border: 1px solid @rgb-color;
   background: @rgba-color;
   padding: @nonexistant + 4px;
 }
 
 @hello: 44px;
 @something: "hello";
 @cool: something;
 
 outer1: @@something;
 outer2: @@@cool;