Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.3.10)
// Compass (v1.0.0.alpha.20)
// ----

$map-1: (
  key-1-1: "value-1-1",
  key-1-2: "value-1-2",
  key-1-3: "value-1-3",
  key-1-4: "value-1-4"
);

$map-2: (
  key-2-1: "value-2-1",
  key-2-2: "value-2-2",
  key-2-3: "value-2-3",
  key-2-4: "value-2-4"
);

$map-3: (
  key-3-1: "value-3-1",
  key-3-2: "value-3-2",
  key-3-3: "value-3-3",
  key-3-4: "value-3-4"
);

$map-list: $map-1 $map-2 $map-3;

@each $map in $map-list {
  @each $map-key, $map-value in $map {
    .#{$map-key} {
      width: $map-value;
    }
  }
}

SassMeister-output.css

.key-1-1 {
  width: "value-1-1";
}

.key-1-2 {
  width: "value-1-2";
}

.key-1-3 {
  width: "value-1-3";
}

.key-1-4 {
  width: "value-1-4";
}

.key-2-1 {
  width: "value-2-1";
}

.key-2-2 {
  width: "value-2-2";
}

.key-2-3 {
  width: "value-2-3";
}

.key-2-4 {
  width: "value-2-4";
}

.key-3-1 {
  width: "value-3-1";
}

.key-3-2 {
  width: "value-3-2";
}

.key-3-3 {
  width: "value-3-3";
}

.key-3-4 {
  width: "value-3-4";
}