Well-formedness rule for repairs (WFR) A repair α γ is well-formed if and only if there is a string β such that the string αβ and * γ is well-formed, where β is a completion of the constituent directly dominating the last element of α.
(and is to be deleted if that last element is itself a sentence connective) the string α is a prefix of a phrase whose completion, β-if it were present-would render the whole phrase αβ grammatically conjoinable with the repair γ.