Test the iterated linked lists
e d c b a
e
d
c
b
a
First item:e
x
After delete first:c b a x
y d c b a x
y
d c b a z
d

For list p = (4 25 4 12 -9 17)
     item 4 has remainder   (25, 4, 12, -9, 17)
     item 25 has remainder   (4, 12, -9, 17)
     item 4 has remainder   (12, -9, 17)
     item 12 has remainder   (-9, 17)
     item -9 has remainder   (17)
     item 17 has remainder   ()
The average of the values in p is 8.833333333333334