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def merge(xs):
xs.sort()
result = xs[0:1]
for a, b in xs[1:]:
y, z = result[-1]
if a <= z:
result[-1] = (y, max(b, z))
else:
result.append((a, b))
return result
inputs = [([(0,1),(3,5),(4,8),(10,12),(9,10)], [(0,1),(3,8),(9,12)]),
([(1,2),(2,3)], [(1,3)]),
([(1,5),(2,3)], [(1,5)]),
([(1,10),(2,6),(3,5),(7,9)], [(1,10)]),
]
for x, expected in inputs:
result = merge(x)
print(x)
print(result)
assert result == expected
print("Success!")
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