I was just introduced to this at Sunday’s open mic and I have not tried this yet. Lipogram means “leaving out a letter.” Larousse defines a lipogram as a “literary work in which one compels oneself strictly to exclude one or several letters of the alphabet.” Now omitting a particular consonant would not be too difficult; just don’t use words that contain that consonant. For example, “The Raven” contains no Zs, but it’s not apparent that Poe did that intentionally. But, leaving out a particular vowel would be much more challenging. Let’s try this!