Shift/Reduce and Reduce/Reduce conflicts.

["fidel viegas" <viegasfh@hotmail.com>]

Hi!
Is there any documentation regarding the interpretation of the conflicts 
that may urge in the design of the grammar under SableCC?
I had some conflicts messages, but I don't know how to interpret them. I 
could solve them by looking at the books, but the way the message is 
expressed is to complicated. How do we interpret them. For example, In the 
following production

If_statement =
  {If_stmt} if expression then statement |
  {If_then_else} if expression then statement else statement ;

This generates a shift/reduce conflict in sablecc. How can we interpret the 
message issued by SableCC?
Regards,
Fidel Viegas.
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