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def check_connection(network, first, second): elements = set() future = [] neighbours = {} for i in network: for m in i.split('-'): elements.add(m) for i in elements: neighbours[i]=set() for element in elements: for i in network: if element in i.split('-'): for k in i.split('-'): neighbours[element].add(k) if first in neighbours: for i in neighbours[first]: if i == second: return True else: future.append(i) while len(future) != 0: for i in future[:]: for g in neighbours[i]: if g == second: return True else: future.append(g) future.remove(i) else: return False