Increment a number, given its digits
Multiply a column by a row
Getting the absolute index from a matrix
Decipher the number 4 - 3 keys - order [1 2 3 2 1 2 3 ......]
Decipher the message - same key for all digits
Find the magnetic field around the wire
Find the magnetic field in sollinoid
Decipher the number 3 - 10 keys
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