$widths: (
  '-measure': 30rem,
  '-measure-wide': 34rem,
  '-measure-narrow': 20rem,
  '-10': 10%,
  '-20': 20%,
  '-25': 25%,
  '-30': 30%,
  '-40': 40%,
  '-50': 50%,
  '-60': 60%,
  '-70': 70%,
  '-75': 75%,
  '-80': 80%,
  '-90': 90%,
  '-100': 100%,
  '-third': (100% / 3),
  '-two-thirds': (100% / 1.5),
  '-auto': auto
);

@include generateFromMap(
  $map: $linear-scale,
  $append-map: $widths,
  $selector-prefix: 'w',
  $properties: width
);