points:
  zones:
    matrix:
      mirror:
        ref: matrix_only_first
        distance: 30
      columns:
        only.rows:
          first.bind: 0
          second.bind: [0,10,0,10]
          third.bind: [10,0,10,0]
          fourth.bind: [u, u/2, u/3, u/4]
outlines:
  bound:
    - what: rectangle
      where: true
      size: 20
      bound: true