text: export default class Colour {
  
      constructor(r, g, b) {
          this.r = r
          this.g = g
          this.b = b
      }
  
      merge(other) {
          return new Colour(
              (this.r + other.r) / 2,
              (this.g + other.g) / 2,
              (this.b + other.b) / 2,
          )
      }
  }