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2.4.17 The PUSH Instruction
     PUSH [ expr ] ;

The PUSH instruction will add a string to the stack. The string
added will either be the result of the expr, or the nullstring if
expr is not specified.

The string will be added to the top of the stack (LIFO), i.e. it
will be the first line normally extracted from the stack. For a
thorough discussion of the stack and the methods of manipulating
it, see chapter Stack for a discussion of the stack.



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