// Convert shorthand to the 4-value syntax
@function unpack($shorthand) {
@if length($shorthand) == 1 {
@return nth($shorthand, 1) nth($shorthand, 1) nth($shorthand, 1) nth($shorthand, 1);
}
@else if length($shorthand) == 2 {
@return nth($shorthand, 1) nth($shorthand, 2) nth($shorthand, 1) nth($shorthand, 2);
}
@else if length($shorthand) == 3 {
@return nth($shorthand, 1) nth($shorthand, 2) nth($shorthand, 3) nth($shorthand, 2);
}
@else {
@return $shorthand;
}
}
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