:   '''dict lappend''' ''dictionaryVariable'' ''key'' ?''value'' ''...''?

This appends the given items to the list value that the given key maps to in the [dict]ionary value contained in the given variable, writing the resulting dictionary value back to that variable. Non-existent keys are treated as if they map to an empty list, and it is legal for there to be no items to append to the list. It is an error for the value that the key maps to to not be representable as a list.

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