An American student accused of killing her British housemate Meredith Kercher in 2007 has spent a second day under intensive cross-examination.
Amanda Knox, 21, said she had been threatened by police with 30 years in jail if she continued to "lie".
She also denied previously meeting the man convicted in October of murder and sexual violence in the same case.
Miss Knox and then boyfriend Raffaele Sollecito deny charges they murdered Meredith after a sex game went wrong.
A third person, 22-year-old Ivory Coast national Rudy Guede, has already been jailed for 30 years for the killing.
During Saturday's hearing, Miss Knox denied being friends with Mr Guede, but said she had met him three times.
Questioned by Mr Sollecito's lawyer she also said she rejected the evidence of an Albanian witness, Hekuran Kokomani, who told the court in March that he had seen Miss Knox and Mr Sollecito on an unspecified date with Mr Guede.
Miss Knox said: "This is completely false. It's impossible."
Speaking in fluent Italian, the 21-year-old from Seattle said police pressured her to wrongly implicate an innocent man during questioning - a claim prosecutors are disputing.
Miss Knox claimed police wanted her to name a suspect and repeated her allegation that they had beaten and bullied her into making a false statement.
She alleged that during hours of questioning, police said if she did not tell the truth, they would "throw me in jail for 30 years".
Duncan Kennedy, in Perugia
It was a more casually dressed Amanda Knox who has taken the stand for a second day. She is wearing jeans and a white blouse.
The questioning has been started by the prosecuting magistrate, Giuliano Mignini, a thick-set man who has been pressing the attacks against Amanda Knox for the past five months.
Amanda Knox's supporters don't like Mr Mignini. They think he is not a fair prosecutor.
But he has certainly begun his cross examination with some direct questions and there've been some raised voices.
He could yet question her about her whereabouts on the night Meredith Kercher died and the forensic evidence against her.
Amanda is again speaking in Italian, she wasn't happy with her translator yesterday and has decided her Italian is good enough to take on the lawyers.
Her father and her defence team say they felt she did well in the witness box yesterday. Today will be just as testing.
Ms Kercher, 21, of Coulsdon, south London, was stabbed to death on 1 November 2007.
The Leeds University student's body was discovered in the bedroom of the house she shared with Miss Knox in the Umbrian university city of Perugia the following day. Her throat had been cut.
Defence lawyers accused chief prosecutor Giuliano Mignini of badgering Miss Knox and asking leading questions.
When questioned about wrongly naming her part-time employer Patrick Lumumba as the killer to the police, she said she became so confused after "a steady crescendo... of 'I don't know,' 'you're a stupid liar', 'maybes', and 'imagines' that ... I was led to believe I had forgotten things".
"When I said 'Patrick' I actually started to imagine a kind of movie, images that could have explained the situation, Patrick's face, then (Perugia's) Grimana square, then my house on the night of the murder," she added.
When questioned about yoga and stretching exercises she did at the police station, she said: "Everyone deals with tragedy in his own way. I'm always trying to feel less stress. I know I may appear spacy, but that's how I am."
Defence lawyer Carlo Dalla Vedova then asked Miss Knox about the knife which was discovered at Mr Sollecito's flat, but belonged to the American.
She told me she got on really well with her roommates
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