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	difficulty level: 1 (simple feistel network)

	paul and his little brother john entered their room, paul turned on the light. yhey
noticed it immediatly. something was missing. some noise in the staircase, they could see their
brother and his friend and ... their teddy bear. their mascot. running would be meaningless,
both brothers are too young, they would never get their teddy bear back. as john is an
experimented spy, he could get in his brother' s room some days laters and stole some
interesting files. both brothers are now begging your help. they found a program that can
encrypt, and an interesting encrypted file.

	your task is to code a decryption routine for the encryption algorithm, decrypt the file
and help the brothers find their teddy bear. the brother and his friend aren' t really good in
crypto, so their algorithm is easy to reverse, and is quite weak.

	thigo, i know this story is lame, but you wrote a story too, and you know what lack of
inspiration is =)
	sorry for the first version of this cryptanalyse-me, but it was late when i coded it
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										      roy|fleur

