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─────Run-Time Library───────────────────────────────────────────────────────
 
     The _swab function copies <n> bytes from <src>, swaps each pair of
     adjacent bytes, and stores the result at <dest>. The integer <n>
     should be an even number to allow for swapping. The _swab function
     is typically used to prepare binary data for transfer to a machine
     that uses a different byte order.
 
     Return Value
 
     None.
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