a, b { color: red; background: blue; }

c, d { color: gray; }
c e, c f, d e, d f { background: blue; padding: 10px 5px; }
c g, c h, d g, d h { blah: blah; bloo: bloo; }
c i, c j, d i, d j { foo: goo; }
c i k, c i l, c j k, c j l, d i k, d i l, d j k, d j l { hoo: boo; }
c i k m, c i k n, c i k o, c i l m, c i l n, c i l o, c j k m, c j k n, c j k o, c j l m, c j l n, c j l o, d i k m, d i k n, d i k o, d i l m, d i l n, d i l o, d j k m, d j k n, d j k o, d j l m, d j l n, d j l o { wow: we are far inside; but: it still works; }