hlynx

@margins: 0, 5, 10, 15, 20, 30, 40, 50, 60, 70, 80;
.margin-mixin();
.margin-mixin(@i: length(@margins)) when (@i > 0) {
    .margin-mixin(@i - 1);
    @margin: extract(@margins, @i);
    .margin-@{margin} {
        margin-bottom: ~"@{margin}px";
    }
}