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@mixin box-shadow($shadow...) {
@if $enable-shadows {
$result: ();
$has-single-value: false;
$single-value: null;
@each $value in $shadow {
@if $value != null {
@if $value == none or $value == initial or $value == inherit or $value == unset {
$has-single-value: true;
$single-value: $value;
} @else {
$result: append($result, $value, "comma");
}
}
}
@if $has-single-value {
box-shadow: $single-value;
} @else if (length($result) > 0) {
box-shadow: $result;
}
}
}
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