No Proper Program Contains An Indication Which As An Operator-applied Occurrence Identifies An Operator-defining Occurrence Which As An Indication-applied Occurrence Identifies An Indication-defining Occurrence Different From The One Identified By The Given Indication As An Indication-applied Occurrence.

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No proper program contains an indication which as an operator-applied
occurrence identifies an operator-defining occurrence which as an
indication-applied occurrence identifies an indication-defining
occurrence different from the one identified by the given indication as
an indication-applied occurrence.
-- ALGOL 68 Report

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