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class Solution(object):
def mergeTwoLists(self, l1, l2):
"""
:type l1: ListNode
:type l2: ListNode
:rtype: ListNode
"""
if l1==None and l2==None:
return None
if l1==None:
return l2
if l2==None:
return l1
if l1.val<l2.val:
l1.next = self.mergeTwoLists(l1.next,l2)
return l1
if l2.val<l1.val:
l2.next = self.mergeTwoLists(l1,l2.next)
return l2
elif l1.val==l2.val:
l1.next = self.mergeTwoLists(l1.next,l2)
return l1