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correction: when using sliding tile puzzle info (start position, end position, maximum number of moves, i.e. depth of bfs search graph) from an unsolvable STP to create a solvable STP with the same number of moves, the position of the blank must be preserved. This topic will be clarified in the lecture on Monday Feb 10.
Jan 22 r*EcQ81a ignore this lecture from timestamp 22:00 onwards: incorrect information appears there.
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