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There is some danger in using 'accidental' subtype relationships that arise
from similar but unrelated hedge types.
We could have:
president isa manager isa employee isa person
vice-president isa manager isa employee isa person
and hedge types:
company-bowling-team -> (employee+)
5-year-plan-strategists -> (president, vice-president*)
Yes, the president and vice-presidents could form a bowling team,
but it's unlikely that the author of these types had that in mind.