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How do you access the various parts of the rax, rbx, rcx, and rdx registers?

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Replace R below by a, b, c, or d.

rRx - access whole 64 bit register
eRx - access 32 bit register
Rx - access lower 16 bits of eRx
Rh - access top 8 bits of Rx
Rl - access lower 8 bits of Rx
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