Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to make a professional wrestling federation [title] Put strong wooden or steel poles in four corners outside of the trampoline. [step] Add sturdy ropes around it. Make sure the ropes are tight enough to jump on.

Ending1: Lots of poles aren't really necessary, but they do add some extra visibility. [title] It is the correct time for an event to start, but try to make sure that there is at least one person watching the event. Ending2: [title] Put safety equipment on the poles at the end. [step] Put anti-stand machines all around the trampoline. Ending3: [title] Once you've put the ropes on, get turnbuckles and attach them to each corner. [title] Put some mats around the trampoline so you can have some outside the ring activity. Ending4: Only one really good or strong rope could get the job done. [title] Put ladders in one corner of the trampoline and rope parts in a row near that corner.

Answer format: ending1/ending2/ending3/ending4