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We tested FCD also on the largest closed-class classification problem 252 (task I) from the 2012 PAN competition: open-class problems were not 253 considered as the simple classification algorithm adopted does not allow a 254 rejection class. Using a corpus of 14 test and 28 training texts belonging 255 to 14 different authors, the FCD (using a simple nearest neighbour classi- 256 fication criterion) assigns correctly 12 out of 14 documents to their correct 257 authors. Out of the 25 which took part to the competition, only 4 methods 258 submitted by three groups (Sapkota and Solorio, 2012; Tanguy et al., 2012; 259 Popescu and Grozea, 2012) outperformed our method (all of them with 13 260 documents correctly recognized). As a comparison, the NCD and trigrams- 261 based CNG (using the most meaningful 1000 trigrams per document, as this 262 setting yields the best results in Table 2) assigned 2 and 9 documents out 263 of 14 to the correct author, respectively. The results in Tables 4 and 5 are 264 encouraging, specially if we consider that the FCD is a general method which 265 is not specific for the described tasks. 266 

