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async def combinations(itr: AnyIterable[T], r: int) -> AsyncIterator[Tuple[T, ...]]:
"""
Yield r length subsequences from the given iterable.
Simple wrapper around itertools.combinations for asyncio.
This will consume the entire iterable before yielding values.
Example:
async for value in combinations(range(4), 3):
... # (0, 1, 2), (0, 1, 3), (0, 2, 3), (1, 2, 3)
"""
pool: List[T] = await list(itr)
for value in itertools.combinations(pool, r):
yield value