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@mixin box-shadow($shadow...) {
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@mixin box-shadow($shadow...) {
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  @if $enable-shadows {
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  @if $enable-shadows {
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    $result: ();
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    $result: ();
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    @if (length($shadow) == 1) {
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    @each $value in $shadow {
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      // We can pass `@include box-shadow(none);`
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      @if $value != null {
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      $result: $shadow;
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        $result: append($result, $value, "comma");
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    } @else {
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      // Filter to avoid invalid properties for example `box-shadow: none, 1px 1px black;`
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      }
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      @for $i from 1 through length($shadow) {
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        @if nth($shadow, $i) != "none" {
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      @if $value == none and length($shadow) > 1 {
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          $result: append($result, nth($shadow, $i), "comma");
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        }
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        @warn "The keyword 'none' must be used as a single argument.";
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      }
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      }
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    }
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    }
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    @if (length($result) > 0) {
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    @if (length($result) > 0) {
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      box-shadow: $result;
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      box-shadow: $result;
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    }
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    }
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  }
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  }