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- def encrypt(s1):
- s2 = map(lambda c : chr(ord(c) + 2), s1)
- return ''.join(s2)
- def decrypt(s1):
- s2 = map(lambda c : chr(ord(c) - 2), s1)
- return ''.join(s2)
- s = "xtherussiansarecomingx"
- print(decrypt(encrypt(encrypt(s)))==encrypt(s))
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