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## find missing ranges between low and high in the given array.
# ex) [3, 5] lo=1 hi=10 => answer: [1->2, 4, 6->10]
def missing_ranges(nums, lo, hi):
res = []
start = lo
for num in nums:
if num < start:
continue
if num == start:
start += 1
continue
res.append(get_range(start, num-1))
start = num + 1
if start