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 .demo (light, @color) {
   color: lighten(@color, 10%);
 }
 .demo (@_, @color) {
   display: block;
 }
 
 @switch: light;
 
 .class {
   .demo(@switch, #888);
 }
 
 // by arity
 
 .mixin () {
     zero: 0;
 }
 .mixin (@a: 1px) {
     one: 1;
 }
 .mixin (@a) {
     one-req: 1;
 }
 .mixin (@a: 1px, @b: 2px) {
     two: 2;
 }
 
 .mixin (@a, @b, @c) {
     three-req: 3;
 }
 
 .mixin (@a: 1px, @b: 2px, @c: 3px) {
     three: 3;
 }
 
 .zero {
     .mixin();
 }
 
 .one {
     .mixin(1);
 }
 
 .two {
     .mixin(1, 2);
 }
 
 .three {
     .mixin(1, 2, 3);
 }
 
 //
 
 .mixout ('left') {
     left: 1;
 }
 
 .mixout ('right') {
     right: 1;
 }
 
 .left {
     .mixout('left');
 }
 .right {
     .mixout('right');
 }
 
 //
 
 .border (@side, @width) {
     color: black;
     .border-side(@side, @width);
 }
 .border-side (left, @w) {
     border-left: @w;
 }
 .border-side (right, @w) {
     border-right: @w;
 }
 
 .border-right {
     .border(right, 4px);
 }
 .border-left {
     .border(left, 4px);
 }
 
 //
 
 
 .border-radius (@r) {
     both: @r * 10;
 }
 .border-radius (@r, left) {
     left: @r;
 }
 .border-radius (@r, right) {
     right: @r;
 }
 
 .only-right {
     .border-radius(33, right);
 }
 .only-left {
     .border-radius(33, left);
 }
 .left-right {
     .border-radius(33);
 }
 
 .hola(hello, @hello...) {
         color: blue;
 }
 
 #hola {
         .hola(hello, world);
         .hola(jello, world);
 }
 
 .resty(@hello, @world, @the_rest...) {
         padding: @hello @world;
         rest: @the_rest;
 }
 
 #nnn {
         .body(10, 10, 10, 10, 10);
         .body(10, 10, 10);
         .body(10, 10);
         .body(10);
         .body();
 }
 
 .defaults(@aa, @bb:e343, @cc: "heah", ...) {
         height: @aa;
 }
 
 #defaults_1 {
         .defaults();
         .defaults(one);
         .defaults(two, one);
         .defaults(three, two, one);
         .defaults(four, three, two, one);
 }
 
 
 .thing() { color: green; }
 .thing(...) { color: blue; }
 .thing { color: red; }
 
 #aa {
         .thing();
 }
 
 #bb {
         .thing;
 }
 
 
 #cc {
         .thing(1);
 }