Given a class for a BasicPlan, write the classes for StandardPlan and PremiumPlan which have class attributes of the following:
BasicPlan StandardPlan Premium Plan
can_stream ✓ ✓ ✓
can_download ✓ ✓ ✓
SD OR HD has_SD has_HD has_UHD
num_of_devices 1 2 4
price $8.99 $12.99 $15.99
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