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Dec 18th, 2014
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  1. T = int(raw_input())
  2. for t in range(T):
  3. m,n = map(long, raw_input().split())
  4. if n >= 2*m or n == 0:
  5. print 0
  6. else:
  7. sol = m
  8. for i in range(m+1, n+1):
  9. sol = sol & i
  10. if sol == 0:
  11. break
  12. print sol
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