This is a little homework for our space fan historians, so we suggest you travel back in time to find the answer.
#ArianeGroup #Ariane5pic.twitter.com/S6NJWHeEKG
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They don't, but there's was a little typo in the question it's between two Ariane missions! 
This explains everything! I was curious how were you able to recycle the launch pad in 5 days
Now it’s clear, as Ariane 5 flies from ELA-3 and Ariane 4 flew from ELA-2!
There you go. 
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