For the present experiments, we designed a moderately simple one that employs (1) conditioning on one character of right context, (2) latent "edit" and "no-edit" regions to capture the fact that groups of edits are often made in close proximity, and (3) some simple special handling for the distribution conditioned on the root p(w y | ♦).
-other things equal-Barack Obama is more plausibly a variant of Barack Obama, Jr. than of Barack Obama, Sr. (which has fewer tokens).