foo {
  color: blue; }

foo--modifier {
  color: red; }

foo {
  color: blue; }
  foo bar {
    color: red; }

foo {
  color: blue; }
  bar foo {
    color: red; }

foo {
  color: blue; }
  bar baz {
    color: red; }

bar foo {
  color: red; }
  bar foo baz {
    color: blue; }