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class PlayField:
def __init__(self):
self.grid = [[None] * 10 for _ in range(20)]
def burn_rows(self) -> int:
""" Burn rows that can be filled and return how many of them were burnt """
rows_to_burn = []
for row in self.grid:
if all(map(lambda element: element is not None, row)):
rows_to_burn.append(row)
for row in rows_to_burn:
self.grid.insert(0, [None] * 10)
self.grid.remove(row)
return len(rows_to_burn)
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