You surely cannot be so ignorant as not to know that a well made x is neither more nor less than two c's joined together back to back, instead of these senseless crosses you seem so fond of; and as to your z's, I defy any one to distinguish them from your y's.
"Marriage"
Susan Edmonstone Ferrier
"Where do you get your X's and z's?
"Hildegarde's Harvest"
Laura E. Richards
Cube root, all historic dates, all x, y, z's, were as printing to her, dinned into the warp and woof of her by patient reiteration.
"Four Girls and a Compact"
Annie Hamilton Donnell