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$colors-list: #3b5999 #55acee #e4405f #cd201f #dd4b39;
@each $bg-color in $colors-list {
  $i: index($colors-list, $bg-color);
  li:not(:last-child):nth-child(#{$i}) a {
    background: $bg-color;
    @include square(32px);
  }
}