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-n (genitive case)
the seven wonders of the world
maailman seitsemän ihmettä
-a (partitive case)
a piece of cake
pala kakkua
The partitive refers to the selection of a part/quantity out of a group/amount.
Partitive Proportion is the partition of a whole into equal or unequal parts based on the two ratios.
:))))))))))
kinenam
You would use the partitive appropriate for the situation, such as 'some of the milk', 'part of the milk', or 'all of the milk'.