Return Iterable view of values
Combines individual Key->Values relations into a single flat ordering.
[['Card', 'card'],['Cat', 'cat', 'CAT']] -> ['Card', 'card','Cat', 'cat', 'CAT'].
[['Card', 'card'],['Cat', 'cat', 'CAT']]
['Card', 'card','Cat', 'cat', 'CAT']
Iterable<V> get values;