.mixin (…) {

variadic: true;

} .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);

}