The evening after national lockdown was lifted, a couple decided to celebrate their newfound freedom at a bar down the street. Much to their surprise, they find four other couples there who had the same idea. Eager for social contact, every person in the five couples enthusiastically hugs each person they had not met before. It turns out that many of the people had actually known each other prior, so when the wife asks everyone how many elbows they each tapped, she remarkably gets nine different answers!

How many elbows did her husband tap?