Useless rules

Useless rules
In formal grammar, useless rules are rules of symbol production which are unreachable or unproductive, that is, they are rules of production which can never be applied.

Cleaning Useless Rules

Examples

S to Bb | Cc

B to Bb | b

C to Cc | c

D to Bd | Cd

D is unreachable.

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Last updated on Sunday February 19, 2006 at 12:39:06 PST (GMT -0800)
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