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This command exchange the links of the current room with those of the chosen one from all respective directions. It effectively swaps the position of two rooms within a level. Reciprocal links are swapped as well, while non-reciprocal ones are left alone. It’s an integer input whose parameter i is a room number. See Integer input.
It gives instant visual feedback by changing the currently displayed room to the chosen one. BACKSPACE confirms the exchange with the currently displayed room and keeps it on display, while / cancels the exchange and reverts back to the room displayed before this command invocation.