CREATE TABLE table_2001348_1 (revising_convention_s_ VARCHAR, denunciations__september_2011_ VARCHAR)

What were the revising conventions commentary with a denunciation of 21?
SELECT revising_convention_s_ FROM table_2001348_1 WHERE denunciations__september_2011_ = 21
SELECT "revising_convention_s_" FROM "table_2001348_1" WHERE "denunciations__september_2011_" = 21