Description: 4-Tower of the solution process. Solution ideas : If a, b, c, d pillar. It is necessary to a first-n moved to the target site columns (columns d), the first two of the top two parts, on the part of the column moved to the b, c moved to the second half-and then moved to the site n goal post, and then c-plate then moved to the goal post and then moved to the b-plate goal post. details of places : move on the part of the b-time, the intermediate variables pole is one of the two election. and moved to the second half of c-, It intermediate pole only one variable (because a pole has been part of the first half of the total). b, c also moved to the goal post at the same reason.
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