219.--THE LETTER BLOCK PUZZLE.

From Amusements in Mathematics by Henry Ernest Dudeney.

This puzzle can be solved in 23 moves--the fewest possible. Move the blocks in the following order: A, B, F, E, C, A, B, F, E, C, A, B, D, H, G, A, B, D, H, G, D, E, F.

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219.--THE LETTER BLOCK PUZZLE.: Amusements in Mathematics by Henry Ernest Dudeney | amphi