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6407
Bad Signal
Very easy
6408
Cracking the Safe
Medium
6409
Dreaded Alternating Game
Very easy
6410
Encryption
Very easy
6411
Fare Dodging
Very easy
6412
Genuine Messages
Very easy
6413
How Much?
6414
Identification Codes
Very easy
6415
Just Enough Space
Very easy
6416
Keys
Easy
6417
Administrative Difficulties
Easy
6418
Bribe
Medium
6419
Cracking the Code
6420
Destination Unknown
Very easy
6421
Encoded Coordinates
6422
Flying Safely
6423
Getting Through
Medium
6424
Hidden Camera
Hard
6425
Incognito
6426
Jailbreak
Very easy
6427
Beehives
Very easy
6428
Bits Equalizer
Medium
6429
LCM Pair Sum
Easy
6437
Analyzing Bit (Yet Special) Strings
Easy
6438
Bits Are Dangerous
Easy
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