Symbol Attributes

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Symbol Attributes
=================

   Every symbol has, as well as its name, the attributes "Value" and
"Type".  Depending on output format, symbols can also have auxiliary
attributes.

   If you use a symbol without defining it, `as' assumes zero for all
these attributes, and probably won't warn you.  This makes the symbol
an externally defined symbol, which is generally what you would want.

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