@a: 2; @x: (@a * @a); @y: (@x + 1); @z: (@x * 2 + @y); @var: -1;

.variables {

width: (@z + 1cm); // 14cm

}

@b: @a * 10; @c: #888;

@fonts: “Trebuchet MS”, Verdana, sans-serif; @f: @fonts;

@quotes: “~” “~”; @q: @quotes; @onePixel: 1px;

.variables {

height: (@b + @x + 0px); // 24px
color: @c;
font-family: @f;
quotes: @q;

}

.redef {

@var: 0;
    .inition {
            @var: 4;
            @var: 2;
            three: @var;
            @var: 3;
    }
    zero: @var;

}

.values {

    minus-one: @var;
@a: 'Trebuchet';
@multi: 'A', B, C;
font-family: @a, @a, @a;
color: @c !important;
multi: something @multi, @a;

}

.variable-names {

@var: 'hello';
@name: 'var';
name: @@name;

}

.alpha {

@var: 42;
filter: alpha(opacity=@var);

}

.polluteMixin() {

@a: 'pollution';

} .testPollution {

@a: 'no-pollution';
a: @a;
    .polluteMixin();
    a: @a;

}

.units {

width: @onePixel;
same-unit-as-previously: (@onePixel / @onePixel);
square-pixel-divided: (@onePixel * @onePixel / @onePixel);
odd-unit: unit((@onePixel * 4em / 2cm));
percentage: (10 * 50%);
pixels: (50px * 10);
conversion-metric-a: (20mm + 1cm);
conversion-metric-b: (1cm + 20mm);
conversion-imperial: (1in + 72pt + 6pc);
custom-unit: (42octocats * 10);
custom-unit-cancelling: (8cats * 9dogs / 4cats);
mix-units: (1px + 1em);
invalid-units: (1px * 1px);

}