Passage: The official investigation into the deaths of the imprisoned RAF members concluded that they had committed suicide: Baader and Raspe using handguns allegedly smuggled into the Stammheim maximum security prison by their lawyer Arndt Müller, Ensslin by hanging herself. Irmgard Möller, who was imprisoned with them, survived with four knife wounds in her chest. She later claimed that the "suicides" were actually extrajudicial killings. On 12 November Ingrid Schubert was found hanged in her cell.

Question: how many times wass Irmgard stabbed in the chest with  a knife?
four