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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:

D	A	N	G
E	R	L	I
E	S	B	E
F	O	R	E
Y	O	U	W
H	I	L	E
S	A	F	E
T	Y	L	I
E	S	B	E
H	I	N	D
T	W	O	O
F	U	S	W
I	L	L	H
E	L	P	Y
O	U	W	H
I	C	H	E
V	E	R	Y
O	U	W	O
U	L	D	F
I	N	D

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.

D	A	N	G
E	R	L	I
E	S	B	E
F	O	R	E
Y	O	U	W
H	I	L	E
S	A	F	E
T	Y	L	I
E	S	B	E
H	I	N	D
T	W	O	O
F	U	S	W
I	L	L	H
E	L	P	Y
O	U	W	H
I	C	H	E
V	E	R	Y
O	U	W	O
U	L	D	F
I	N	D

D	A	N	G
E	R	L	I
E	S	B	E
F	O	R	E
Y	O	U	W
H	I	L	E
S	A	F	E
T	Y	L	I
E	S	B	E
H	I	N	D
T	W	O	O
F	U	S	W
I	L	L	H
E	L	P	Y
O	U	W	H
I	C	H	E
V	E	R	Y
O	U	W	O
U	L	D	F
I	N	D

D	A	N	G
E	R	L	I
E	S	B	E
F	O	R	E
Y	O	U	W
H	I	L	E
S	A	F	E
T	Y	L	I
E	S	B	E
H	I	N	D
T	W	O	O
F	U	S	W
I	L	L	H
E	L	P	Y
O	U	W	H
I	C	H	E
V	E	R	Y
O	U	W	O
U	L	D	F
I	N	D