Half-alphabet lipograms (HALs) limit words to half of the alphabet. The title is limited to A-M. Any other way of dividing the alphabet in two is also included. The challenge is to convert ordinary prose into HALs by crook or innuendo and leave the text readable.
Word Ways: Vol. 47
, Article 18.
Available at: http://digitalcommons.butler.edu/wordways/vol47/iss1/18