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We're using the dropbox format with hierarchical select to let our customers choose flavors for a tin of popcorn. The flavors are all taxonomy terms and are grouped.
We'd really like to allow the same term to be selected multiple times. So, we allow up to 3 selections. But, if the person wants two of the same flavor, we want to allow that.
As it is now, they can't add the same term a second or third time if it's already been selected once.