a {
  border-property: 1 2 3 4;
}

b {
  border-property: 1 2 3;
}

c {
  border-property: 1 2;
}

d {
  border-property: 1;
}

e {
  border-property: 0;
}

f {
  border-property: 1 2 3 4;
}

n {
  border-property: 1 2;
}