Robust Parsing

Some sentences are not considered grammatical by humans; these are Ungrammatical sentences.
Some sentences are not accounted for by a given grammar; these are Agrammatical sentences.
Plink can account for both Ungrammatical and Agrammatical sentences.
Agrammatical sentences can be eliminated by general rules like S -> word*.
Rules like this should only be applied when grammatical rules are not available.
These 'ungrammatical' rules are selected with a very low preference.
Grammatical parsing proceeds as normal, until an ungrammatical construct is seen.
The ungrammatical construct is absorbed.
Grammatical parsing resumes.