Since the assertions were extracted from Web pages it's reasonable to assume that the answer doesn't exist because no one talked about textrunner prior to it be

Since the assertions were extracted from Web pages it's reasonable to assume that the answer doesn't exist because no one talked about textrunner prior to it being made public. That, or the sample of Web pages didn't contain any pages that referred to textrunner. Another possibility is the structure of the sentence(s) containing a reference to textrunner were not sufficiently simplifiable.