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p {
  font-size: 25px;
  font-size: 1.5625rem;
  margin: 25px 15px;
  margin: 1.5625rem 0.9375rem;
}

// ----
// Sass (v3.3.9)
// Compass (v1.0.0.alpha.20)
// Bourbon (v4.0.2)
// ----

@import "bourbon/bourbon";

//$em-base: 10px;
@mixin px-rem($property, $values...) {
	$pxValues: ();
	$remValues: ();

	@each $value in $values {
		$val: strip-units($value);
		@if not not index("initial" "inherit" "auto" 0, $value) {
			$pxValues: append($pxValues, $val);
			$remValues: append($remValues, $val);
		} @else {
			$pxValues: append($pxValues, $val*1px);
			$remValues: append($remValues, rem($val) );
		}
	}

	#{$property}: $pxValues;
	#{$property}: $remValues;
}
@mixin fs($number) {
  @include px-rem(font-size, $number);
}
p { 
  @include fs(25); 
  @include px-rem(margin, 25, 15);
}