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import asyncio
import websockets

USERS = set()

async def addUser(websocket):
    USERS.add(websocket)

async def removeUser(websocket):
    USERS.remove(websocket)

async def socket(websocket, path):
    await addUser(websocket)

    try:
        while True:
            message = await websocket.recv()
            
            await asyncio.wait([user.send(message) for user in USERS])
    finally:
        await removeUser(websocket)

start_server = websockets.serve(socket, '0.0.0.0', 7860)

asyncio.get_event_loop().run_until_complete(start_server)
asyncio.get_event_loop().run_forever()