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In page Pitești Prison:

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Each subject of the experiment was initially thoroughly interrogated, with torture applied as a mean to expose intimate details of his life ("external unmasking").[3] Hence, they were required to reveal everything they were thought to have hidden from previous interrogations; hoping to escape torture, many prisoners would confess imaginary misdeeds.[4] The second phase, "internal unmasking", required the tortured to reveal the names of those who had behaved less brutal or somewhat indulgently towards them in detention.[3]