gistfile1.css

.grid_1 { width: 120px; margin-left: 20px; }

.another-section { .grid_1; }

/* lessc turns this into: */

.grid_1, .another-section {
  width: 120px;
  margin-left: 20px;
}

/* plessc turns the same code into: */

.grid_1 {
  width:120px;
  margin-left:20px;
}
.another-section {
  width:120px;
  margin-left:20px;
}