In pursuit of the elusive X

Admittedly, the toughest letter (next to "Z") of the AtoZ Challenge to fit into a post.
X, the alphabet letter block most sought after for collectors of Americana.

Xena, my Maine Coon, finally showed up after weeks of absence. My other cat is beating the h**l out of her, being xtra aggressive/territorial. Do you have kitty cat troubles and how did you solve a situation like this? I want to keep both cats, if possible.

And a little ditty about ex's . . .