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Decipher the following message (it was enciphered using a simple matrix transposition cipher - note that the letters are in groups of five):

DEEFY HSTEH TFIEO IVOUI ARSOO IAYSI WULLU CEULN
NLBRU LFLBN OSLPW HRWDD GIEEW EEIED OWHYH EYOF

Answer:

The matrix is:

DANG
ERLI
ESBE
FORE
YOUW
HILE
SAFE
TYLI
ESBE
HIND
TWOO
FUSW
ILLH
ELPY
OUWH
ICHE
VERY
OUWO
ULDF
IND

The message is: "danger lies before you, while safety lies behind. two of us will help you whichever you would find" - from Harry Potter and the Sorcerer's Stone, the start of Professor Snape's poem describing his potion puzzle.