In the screen shot below, you will notice that the indefinite pronoun "both" is separated from the other pronouns that refer to wheat as an antecedent. This misrepresents the terms used for wheat and leaves it up to the user to correct the data based on their knowledge of grammar. If one prescribes to a grammar that does not recognize indefinite pronouns, one would simply change the terminology slightly - to refer to "proform" as what takes its meaning from an antecedent. Any representation that does not show this as an antecedent relationship is misleading.
