.scheme{
  @for $i from 1 through length($schemes) {
    &-#{nth(map_keys($schemes), $i) - 1}{
      @include color-scheme(nth(map_values($schemes), $i));
    }
    &-#{nth(map_keys($schemes), $i)}{
      @include color-scheme(nth(map_values($schemes), $i),true);
    }
  }
}
