The set size should be 7.  Its actual value is 7
Here is the table: 
0:  good-bye
1:  abc
2:  zebra
3:  hello
4:  daddy
5:  
6:  friend
7:  puppy
The set size should be 7.  Its actual value is 7
Here is the table: 
0:  
1:  abc
2:  
3:  
4:  
5:  
6:  
7:  puppy
8:  good-bye
9:  
10:  zebra
11:  hello
12:  
13:  
14:  daddy
15:  friend
"foo" is not in the set
"puppy" is in the set.  The iterator points to puppy
"daddy" is in the set. The iterator points to daddy

Here is the result of iterating: 
abc
puppy
good-bye
zebra
hello
daddy
friend
set1.size() = 7, set2.size() = 7

After five inserts:
set1.size() = 7, set2.size() = 12

The contents of set2:
0:  gymnastics
1:  abc
2:  
3:  
4:  
5:  
6:  dance
7:  puppy
8:  good-bye
9:  baseball
10:  zebra
11:  hello
12:  ardvark
13:  football
14:  daddy
15:  friend
The results of iterating:
gymnastics
abc
dance
puppy
good-bye
baseball
zebra
hello
ardvark
football
daddy
friend

Now testing the erase function.
Tried erase "dance" and got num (should be 1) = 1
Tried erase "abc" and got num (should be 1) = 1
Tried erase "hello" and got num (should be 1) = 1
Here are the contents of set2:
0:  gymnastics
1:  <erased>
2:  
3:  
4:  
5:  
6:  <erased>
7:  puppy
8:  good-bye
9:  baseball
10:  zebra
11:  <erased>
12:  ardvark
13:  football
14:  daddy
15:  friend

Putting the same values back in, but they may be stored in different locations.
Here are the contents of set2:
0:  gymnastics
1:  dance
2:  abc
3:  
4:  
5:  
6:  <erased>
7:  puppy
8:  good-bye
9:  baseball
10:  zebra
11:  hello
12:  ardvark
13:  football
14:  daddy
15:  friend