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What is the bond order for the O2 - anion?
Rubik's Cube
A 3D combination puzzle invented by Ernő Rubik in 1974, consisting of a cube with colored squares that can be twisted but not separated.
Tower of Hanoi
The Tower of Hanoi is a mathematical puzzle consisting of three rods and a number of disks of different sizes that need to be transferred from one rod to another under certain rules.
General Problem Solver
A computer program designed in the 1950s to address the thought processes involved in solving problems, aiming to simulate human problem-solving methods.
Crypt Arithmetic
A type of mathematical puzzle in which the digits are replaced by letters or symbols, and the aim is to figure out the original digits.
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