Number n ::= d | nd       (d in Digit)

Symbol s ::= c | sc | sd   (c in Char)

Atom   a ::= n | s

Expr   e ::= a | (e … e)

2009/06/15 05:16 2009/06/15 05:16
─ tag 
Simple :: 2009/06/15 05:16 COMPUTING/Programming
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