One level of symbolic substitution

To set two variables, &A and &C, to the value &B code:

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SET A = &&B
SET C = &NRSTR(&A)
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After the execution of the first SET statement, &A contains the value &B. When the second SET statement is executed, the CLIST performs symbolic substitution and substitutes &B for &A. &NRSTR prevents any further scan of the statement; therefore, &C is assigned the value &B.