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body {
  font-size: 27px;
}

// ----
// Sass (v3.3.14)
// Compass (v1.0.0.rc.1)
// ----

@function pow($x, $y) {
  $ret: 1;

  @if $y > 0 {
    @for $i from 1 through $y {
        $ret: $ret * $x;
    }
  } 

  @else {
    @for $i from $y to 0 {
        $ret: $ret / $x;
    }
  }

  @return $ret;
}

body {
  font-size: pow(3, 3) * 1px;
}