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Return Stack
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>R n -- R:n Pops PS and push to RS
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2>R x y -- R:x y Equivalent to SWAP >R >R
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R> R:n -- n Pops RS and push to PS
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2R> R:x y -- x y Equivalent to R> R> SWAP
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I -- n Copy RS TOS to PS
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I' -- n Copy RS second item to PS
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J -- n Copy RS third item to PS
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