(S (S (CC But) (S (SBAR (WHADVP (WRB when)) (S (BASENP (PRP it)) (VP (VBZ comes) (ADVP (ADVP (RB right) (RB down)) (PP (TO to) (BASENP (PRP it))))))) (COMMA ,) (S (BASENP (DT no) (JJ irrefutable) (NN evidence)) (VP (VBZ exists) (S (VP (TO to) (VP (VB confirm) (NP (NNS allegations) (SBAR (IN that) (S (BASENP (DT the) (NNP CIA)) (VP (VP (VBD operated) (BASENP (JJ secret) (NN detention) (NNS centers))) (PP (IN in) (BASENP (NNP Europe)))))))))))))) (PERIOD .))