@each $prp, $property in $property-list {
  @each $amt, $amount in $amount-list {
    @each $dir, $direction in $direction-map {
      .#{$prp}#{nth($direction, 1)}#{$amt}, .#{$prp}#{nth($direction, 2)}#{$amt}, .#{$prp}#{nth($direction, 3)}#{$amt} {
        #{$property}-#{$dir}: $amount;
      }
    }
  }
}