Use the public-domain citation

Error²Illinois courts21st and 22nd editions

Illinois closed its official print reporters at the July 1, 2011 changeover, so an opinion filed on or after that date is cited in the public-domain format.¹

1. 1Ill. S. Ct. R. 6; Ill. S. Ct. R. 341(g). Tables: T1.3 States and the District of Columbia; R. 10.3.1(a) Parallel citations in state court documents.
2. 2An error: the rule in note 1 allows one form, and this is not it.