How many levels of mens rea exist for the requirement of accomplice liability?

Question

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Accomplice liability requires two levels of mens rea: (1) intent to assist or encourage the commission of a crime (specific intent), and (2) knowledge of the principal's criminal intent (general intent). In other words, the accomplice must intend to help the principal commit a crime and know that the principal intended to commit that crime.

How Many Levels of mens Rea Exist for the Requirement