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	@solid			@solid
	def double_even(even_num: EvenType) -> EvenType:			def double_even(even_num: EvenType) -> EvenType:
	return EvenType(even_num.num * 2)			return EvenType(even_num.num * 2)
	```			```

	#### Mapping existing classes			#### Mapping existing classes

	```python file=/concepts/types/make_usable.py			```python file=/concepts/types/make_usable.py
	from dagster import PythonObjectDagsterType, make_python_type_usable_as_dagster_type, solid			from dagster import (
				PythonObjectDagsterType,
				make_python_type_usable_as_dagster_type,
				solid,
				)


	class EvenType:			class EvenType:
	def __init__(self, num):			def __init__(self, num):
	assert num % 2 is 0			assert num % 2 is 0
	self.num = num			self.num = num


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