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註釋Abstract: "CRCW-PRAMs can be characterized in terms of unbounded fan-in circuits with AND- and OR-gates. We introduce the notion of SELECT- gates. Combining this with the concept of an unambiguous circuit we are able to give a circuit equivalent of EREW-PRAMs, thus answering an open question of [SV84]. Moreover, circuits with SELECT-gates characterize CRCW-, CREW-, ERCW-, and EREW-PRAMs in a uniform manner."