Fences Switch (485)

Draw a single continuous loop using the gridlines. A clue in a cell indicates how many edges of that cell are used for the loop. The loop may not touch or cross itself. Every number in the grid must switch its position with one of its orthogonal neighbours. There can be more ways how the pairs of numbers switch their positions but the loop has only one unique solution. Two grids will be provided to you in the Puzzle Booklet. You may use any of them to draw the loop. You do not need to write the digits.

Reference: WPC 2016 (65)