Grammars and Parsing: Ambiguity in Sequences
This parser state

KEYWORD DECVAL DECVAL
               ^
               |---------- Lookahead


is not a conflict because a shift action is not possible. There is no production in which A DECVAL follows another DECVAL. There is not even a production in which a VALUE follows another VALUE. Before the lookahead DECVAL can be shifted, the DECVAL at the top of the stack must be reduced to something which can be followed with DECVAL.