9   Array Values
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     As noted, a VALUE cannot directly contain an array.  Instead, it
     contains an OREF for the array.  When an array is assigned to a
     variable, the system simply overwrites the variable's VALUE with a
     new VALUE containing an OREF to the array.  The array itself is
     simply a group of VALUEs stored in virtual memory.  Each element of
     the array is a VALUE and, since any VALUE can contain an OREF, each
     element can refer to another array.