2016–17 Professional U23 Development League
{'<entity_0>': '2016–17 Professional U23 Development League', '<entity_1>': 'Professional Development League'}
[['2016–17 Professional U23 Development League', 'sports season of league or competition', 'Professional Development League']]
The <entity_0> is the fifth season of the <entity_1> system, and the first since the age limit was raised from under-21 to under-23.
['sports season']