http://w3.org/TR/css3-fonts/#font-kerning-prop

[.t1.c1] A paragraph of text.

[.t1.c2] A paragraph of text.

[.t1.c3] A paragraph of text.

[.t2.c1] A paragraph of text.

[.t2.c2] A paragraph of text.

[.t2.c3] A paragraph of text.