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From Coral Treeshrew, 3 Years ago, written in Plain Text.
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  1. import re
  2. def split_pairs(a):
  3.     list=[]
  4.     for i in range(0,len(a),2):
  5.         if i+2 <= len(a):
  6.             list.append(a[i:i+2])
  7.         else:
  8.             list.append(a[i]+'_')
  9.     print(list)
  10.     return list