Find the capacity of the container, when a = 20, b = 15, c = 30. 
Definitions:
Use It or Lose It
A principle suggesting that failing to use certain skills or abilities can lead to their deterioration over time.
Replacement Theory
A hypothesis or theory suggesting that one entity, idea, or system takes the place of another due to various factors such as evolution, innovation, or cultural shifts.
Cue-dependent Forgetting
A theory suggesting that forgetting occurs when the cues present at the time of encoding information are not present at the time of recall.
Autobiographical Memory
A type of memory system consisting of episodes recollected from an individual's life, based on a combination of episodic (personal experiences and specific objects, people, and events experienced at particular time and place) and semantic (general knowledge and facts about the world) memory.
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