The ogonek is functionally equivalent to the cedilla and comma diacritic marks. For that purpose, he introduced the apostrophe, the accent, and the cedilla. The cedilla in the orthography is in the , as is typical of Russian linguistics. Alternate glyphs include rounded dots, old style figures, and alternate cedilla. As in some Helvetica versions, the cedilla is replaced with a comma. Others can be formed using the cedilla combining character. An obsolete spelling of "cedilla" is "cerilla". "Pilcrow" (2008) was his second novel, followed by "Cedilla" in 2011. A cedilla is occasionally used instead of it, but this is technically incorrect. Many printed and online texts still incorrectly use "s with cedilla" and "t with cedilla".