(S (S (NP (NP (BASENP (DT The) (JJ third) (NN block)) (PP (IN of) (BASENP (NNP Wikipedia)))) (PRN (COMMA ,) (SBAR (WHNP (WDT which)) (S (VP (VBD was) (VP (VBN implemented) (BASENP (NN 19) (NNP October) (NN 2005)))))) (COMMA ,))) (VP (VBD was) (VP (VBN issued) (PP (IN without) (NP (BASENP (NN explanation)) (CC or) (BASENP (DT an) (VBN expected) (NN length))))))) (PERIOD .))