What if more than one token combine to reduce an included tone to a weight of <= 0 ?

It's possible that the user could supply a chord name that has more than one token which reduces the weight of a specific interval above the root. It's possible that these weight demerits could obliterate the tone completely.

Start by tracing the parser's handling of chord-name tokens and how multiple weight demerits affect an interval. Reproduce a chord where the combined demerits reduce a tone's weight to zero or below, then establish the expected behavior; the issue does not name files, tests, or a completion condition.

Written by the indexing model from the issue text.