| Classes IAllocate
 ICall
 ICreateCompoundTerm
 ICreateVariable
 ICut
 IDup
 IFail
 IJump
 Instruction
 IPop
 IPushArgument
 IPushConstant
 IPushEnvironment
 IRestoreState
 IRetryMeElse
 IReturn
 ISaveCut
 ISaveState
 IStoreEnvironment
 IThrow
 ITrue
 ITrustMe
 ITryMeElse
 IUnify
 RetryInstruction
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