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$colours:
  "red" #FF0000,
  "blue" #001EFF,
  "green" #00FF00,
  "yellow" #F6FF00;


@each $i in $colours{
  .#{nth($i, 1)}-background {
    background: nth($i, 2);
  }
  .#{nth($i, 1)}-color {
    color:nth($i, 2);
  }
}