#Write a function called count$\_$duplicates. The function

#should have one parameter, a list of integers. The

#function should return the number of integers in the

#list that are duplicates of earlier integers in the

#list.

#

#For example:

#

# count$\_$duplicates$([1,2,2,3,3,3])->3$

#

#There are three duplicates in that list; the second $2,$

#the second $3,$ and the third $3.$

#

#Here are other examples:

#

# count$\_$duplicates$([1,2,3,4,5,6,7])->0$

# count$\_$duplicates$([5,5,5,5,5,5,5,5,5])->8$

# count$\_$duplicates$([7,3,7,3,7,3,7,3])->6$

#Write your function here!