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005 20260205064226.0
008 260111s9999||||xx |||||||||||||| ||und||
020 _a9780718185541
082 _a793.73 P376G
245 0 _aGCHQ puzzle book
260 _aUK
_bPenguin Books
_c2016
300 _a336p.
690 _aPuzzles ;Solving Puzzles ;Puzzle Book
942 _cBK
999 _c199294
_d199294